#line 2 "cpplib/util/template.hpp"
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("avx2")
#include<bits/stdc++.h>
using namespace std;
struct __INIT__{__INIT__(){cin.tie(0);ios::sync_with_stdio(false);cout<<fixed<<setprecision(15);}}__INIT__;
typedef long long lint;
#define INF (1LL<<60)
#define IINF (1<<30)
#define EPS (1e-10)
#define endl ('\n')
typedef vector<lint> vec;
typedef vector<vector<lint>> mat;
typedef vector<vector<vector<lint>>> mat3;
typedef vector<string> svec;
typedef vector<vector<string>> smat;
template<typename T>using V=vector<T>;
template<typename T>using VV=V<V<T>>;
template<typename T>inline void output(T t){bool f=0;for(auto i:t){cout<<(f?" ":"")<<i;f=1;}cout<<endl;}
template<typename T>inline void output2(T t){for(auto i:t)output(i);}
template<typename T>inline void debug(T t){bool f=0;for(auto i:t){cerr<<(f?" ":"")<<i;f=1;}cerr<<endl;}
template<typename T>inline void debug2(T t){for(auto i:t)debug(i);}
#define loop(n) for(long long _=0;_<(long long)(n);++_)
#define _overload4(_1,_2,_3,_4,name,...) name
#define __rep(i,a) repi(i,0,a,1)
#define _rep(i,a,b) repi(i,a,b,1)
#define repi(i,a,b,c) for(long long i=(long long)(a);i<(long long)(b);i+=c)
#define rep(...) _overload4(__VA_ARGS__,repi,_rep,__rep)(__VA_ARGS__)
#define _overload3_rev(_1,_2,_3,name,...) name
#define _rep_rev(i,a) repi_rev(i,0,a)
#define repi_rev(i,a,b) for(long long i=(long long)(b)-1;i>=(long long)(a);--i)
#define rrep(...) _overload3_rev(__VA_ARGS__,repi_rev,_rep_rev)(__VA_ARGS__)

// #define rep(i,...) for(auto i:range(__VA_ARGS__)) 
// #define rrep(i,...) for(auto i:reversed(range(__VA_ARGS__)))
// #define repi(i,a,b) for(lint i=lint(a);i<(lint)(b);++i)
// #define rrepi(i,a,b) for(lint i=lint(b)-1;i>=lint(a);--i)
// #define irep(i) for(lint i=0;;++i)
// inline vector<long long> range(long long n){if(n<=0)return vector<long long>();vector<long long>v(n);iota(v.begin(),v.end(),0LL);return v;}
// inline vector<long long> range(long long a,long long b){if(b<=a)return vector<long long>();vector<long long>v(b-a);iota(v.begin(),v.end(),a);return v;}
// inline vector<long long> range(long long a,long long b,long long c){if((b-a+c-1)/c<=0)return vector<long long>();vector<long long>v((b-a+c-1)/c);for(int i=0;i<(int)v.size();++i)v[i]=i?v[i-1]+c:a;return v;}
// template<typename T>inline T reversed(T v){reverse(v.begin(),v.end());return v;}
#define all(n) begin(n),end(n)
template<typename T,typename E>bool chmin(T& s,const E& t){bool res=s>t;s=min<T>(s,t);return res;}
template<typename T,typename E>bool chmax(T& s,const E& t){bool res=s<t;s=max<T>(s,t);return res;}
const string ds="DRUL";
const vector<lint> dx={1,0,-1,0,1,1,-1,-1};
const vector<lint> dy={0,1,0,-1,1,-1,1,-1};
#define SUM(v) accumulate(all(v),0LL)
#if __cplusplus>=201703L
    template<typename T,typename ...Args>auto make_vector(T x,int arg,Args ...args){if constexpr(sizeof...(args)==0)return vector<T>(arg,x);else return vector(arg,make_vector<T>(x,args...));}
#endif
#define extrep(v,...) for(auto v:__MAKE_MAT__({__VA_ARGS__}))
#define bit(n,a) ((n>>a)&1)
vector<vector<long long>> __MAKE_MAT__(vector<long long> v){if(v.empty())return vector<vector<long long>>(1,vector<long long>());long long n=v.back();v.pop_back();vector<vector<long long>> ret;vector<vector<long long>> tmp=__MAKE_MAT__(v);for(auto e:tmp)for(long long i=0;i<n;++i){ret.push_back(e);ret.back().push_back(i);}return ret;}
using graph=vector<vector<int>>;
template<typename T>using graph_w=vector<vector<pair<int,T>>>;
template<typename T,typename E>ostream& operator<<(ostream& out,pair<T,E>v){out<<"("<<v.first<<","<<v.second<<")";return out;}
#if __cplusplus>=201703L
    constexpr inline long long powll(long long a,long long b){long long res=1;while(b--)res*=a;return res;}
#endif

template<typename T,typename E>pair<T,E>& operator+=(pair<T,E>&s,const pair<T,E>&t){s.first+=t.first;s.second+=t.second;return s;}
template<typename T,typename E>pair<T,E>& operator-=(pair<T,E>&s,const pair<T,E>&t){s.first-=t.first;s.second-=t.second;return s;}
template<typename T,typename E>pair<T,E> operator+(const pair<T,E>&s,const pair<T,E>&t){auto res=s;return res+=t;}
template<typename T,typename E>pair<T,E> operator-(const pair<T,E>&s,const pair<T,E>&t){auto res=s;return res-=t;}
// 128*1024*1024
#define BEGIN_STACK_EXTEND(size) void * stack_extend_memory_ = malloc(size);void * stack_extend_origin_memory_;char * stack_extend_dummy_memory_ = (char*)alloca((1+(int)(((long long)stack_extend_memory_)&127))*16);*stack_extend_dummy_memory_ = 0;asm volatile("mov %%rsp, %%rbx\nmov %%rax, %%rsp":"=b"(stack_extend_origin_memory_):"a"((char*)stack_extend_memory_+(size)-1024));
#define END_STACK_EXTEND asm volatile("mov %%rax, %%rsp"::"a"(stack_extend_origin_memory_));free(stack_extend_memory_);
#line 2 "main.cpp"

template<typename T,typename E,typename Compress,typename Rake,typename Rev>
class link_cut{
    class rake_tree{
        struct node;
        using np=node*;
        struct node{
            unsigned long key,l,r;
            T val,sum;
            // E lazy;
            bool rev=0;
            int cnt=1,dep=0;
            static const node* nil;
            np ch[2]={};
            np p=0;
            node(unsigned long key,T val):key(key),l(key),r(key),val(val),sum(val){}
            bool is_root() {
                return !p||(p->ch[0]!=this&&p->ch[1]!=this);
            }
        };
        Rake rake;
        T et;
        np root=nullptr;
        inline int count(np t){return t?t->cnt:0;}
        inline int depth(np t){return t?t->dep:0;}
        np update(np t){
            if(!t)return t;
            t->cnt=count(t->ch[0])+1+count(t->ch[1]);
            t->dep=max(depth(t->ch[0]),depth(t->ch[1]))+1;
            t->l=t->ch[0]?t->ch[0]->l:t->l;
            t->r=t->ch[1]?t->ch[1]->r:t->r;
            t->sum=rake(rake(t->ch[0]?t->ch[0]->sum:et,t->val),t->ch[1]?t->ch[1]->sum:et);
            return t;
        }
        void rot(np t,bool b){
            np x=t->p,y=x->p;
            if((x->ch[1-b]=t->ch[b]))t->ch[b]->p=x;
            t->ch[b]=x,x->p=t;
            update(x);update(t);
            if((t->p=y)){
                if(y->ch[0]==x)y->ch[0]=t;
                if(y->ch[1]==x)y->ch[1]=t;
                update(y);
            }
        }
        void push(np t){
            // if(t->lazy!=ee){
            //     if(t->ch[0])propagate(t->ch[0],t->lazy);
            //     if(t->ch[1])propagate(t->ch[1],t->lazy);
            //     t->lazy=ee;
            // }
            // if(t->rev){
            //     if(t->ch[0])toggle(t->ch[0]);
            //     if(t->ch[1])toggle(t->ch[1]);
            //     t->rev=0;
            // }
        }
        np splay(np t){
            push(t);
            while(!t->is_root()){
                np q=t->p;
                if(q->is_root()){
                    push(q), push(t);
                    rot(t,q->ch[0]==t);
                }else{
                    np r=q->p;
                    push(r), push(q), push(t);
                    bool b=r->ch[0]==q;
                    if(q->ch[1-b]==t)rot(q,b),rot(t,b);
                    else rot(t,1-b),rot(t,b);
                }
            }
            return t;
        }
        // int lower_bound(T val,np t){
        //     if(!t)return 0;
        //     bool b=val>t->val;
        //     return(b?count(t->ch[0])+1:0)+lower_bound(val,t->ch[b]);
        // }
        // int upper_bound(T val,np t){
        //     if(!t)return 0;
        //     bool b=val>=t->val;
        //     return(b?count(t->ch[0])+1:0)+upper_bound(val,t->ch[b]);
        // }
        // T find_by_order(T idx,np t){
        //     if(idx==count(t->ch[0]))return t->val;
        //     bool b=idx>count(t->ch[0]);
        //     return find_by_order(idx-(b?count(t->ch[0])+1:0),t->ch[b]);
        // }
        public:
        rake_tree(Rake rake,T et):rake(rake),et(et){}
        std::pair<np,np> split(np t,unsigned long key){
            if(!t)return make_pair(nullptr,nullptr);
            bool b=key>t->key;
            auto s=split(t->ch[b],key);
            if(t->ch[b])t->ch[b]->p=0;
            t->ch[b]=b?s.first:s.second;
            if(t->ch[b])t->ch[b]->p=t;
            return b?make_pair(update(t),s.second):make_pair(s.first,update(t));
        }
        std::pair<np,np> split(unsigned long key){
            return split(root,key);
        }
        np merge(np s,np t){
            if(!s)return t;
            if(!t)return s;
            while(s->ch[1])s=s->ch[1];
            splay(s);splay(t);
            s->ch[1]=t;
            t->p=s;
            update(s);
            return s;
        }
        void insert(unsigned long key,T val){
            auto [s,t]=split(key);
            root=merge(s,merge(new node(key,val),t));
        }
        void erase(unsigned long key){
            auto [s,t]=split(key);
            while(t->ch[0])t=t->ch[0];
            splay(t);
            assert(t->key==key);
            if(t->ch[1])t->ch[1]->p=0;
            root=merge(s,t->ch[1]);
            delete(t);
        }
        rake_tree(T et,Rake rake):et(et),rake(rake){}
        inline int size(){return count(root);}
        // inline int count(T val){return upper_bound(val,root)-lower_bound(val,root);}
        // inline int count(int l,int r){return lower_bound(r,root)-lower_bound(l,root);}
        // inline T sum(int l,int r){return sum(l,r,root);}
        inline T all_sum(){return root?root->sum:et;}
        //0-indexでidx番目
        // inline T operator[](T idx){return find_by_order(idx,root);}
        // //x未満の個数/s[lower_bound(x)]はx以上最小の値
        // inline int lower_bound(T x){return lower_bound(x,root);}
        // //x以下の個数/s[upper_bound(x)]はxより大きい最小の値
        // inline int upper_bound(T x){return upper_bound(x,root);}
    };
    public:
    struct node;
    using np=node*;
    struct node{
        np ch[2]={};
        np p=0;
        int key;
        unsigned long id,id_sum,rake_node_id_sum=0;
        T val,path_sum,subtree_sum,subtree_sum2,subtree_sum_rev,subtree_sum2_rev;
        rake_tree rake_node;
        bool rev=0;
        // E lazy=ee;
        int sz=1;
        // node(){}
        inline unsigned long rnd() {
            static unsigned long x=123456789, y=362436069, z=521288629, w=88675123;
            unsigned long t=(x^(x<<11));
            x=y; y=z; z=w;
            return ( w=(w^(w>>19))^(t^(t>>8)) );
        }
        node(unsigned long key,T et,Rake rake):key(key),val(et),path_sum(et),subtree_sum(et),subtree_sum2(et),subtree_sum_rev(et),subtree_sum2_rev(et),rake_node(rake,et){
            id=id_sum=rnd();
        }
        bool is_root(){
            return !p||(p->ch[0]!=this&&p->ch[1]!=this);
        }
    };
    std::vector<np>p;
    Compress compress;
    Rake rake;
    Rev rev;
    T et;
    E ee;
    int size(np t){return t?t->sz:0;}
    void update(np t){
        t->sz=size(t->ch[0])+1+size(t->ch[1]);
        // t->l=t->ch[0]?t->ch[0]->l:t->l;
        // t->r=t->ch[1]?t->ch[1]->r:t->r;
        t->id_sum=(t->id^(t->ch[0]?t->ch[0]->id_sum:0)^(t->ch[1]?t->ch[1]->id_sum:0)^(t->rake_node_id_sum));
        // subtree_sum は親が t, subtree_sum2 は親がt->ch[0]->ch[0]->...
        // t->path_sum=compress(t->ch[0]?t->ch[0]->path_sum:et,compress(t->val,t->ch[1]?t->ch[1]->path_sum:et));
        t->subtree_sum=compress(t->val,rake(t->rake_node.all_sum(),t->ch[1]?t->ch[1]->subtree_sum2:et));
        t->subtree_sum2=compress(t->ch[0]?t->ch[0]->subtree_sum2:et,t->subtree_sum);

        t->subtree_sum_rev=compress(t->val,rake(t->rake_node.all_sum(),t->ch[0]?t->ch[0]->subtree_sum2_rev:et));
        t->subtree_sum2_rev=compress(t->ch[1]?t->ch[1]->subtree_sum2_rev:et,t->subtree_sum_rev);
    }
    void rot(np t,bool b){
        np x=t->p,y=x->p;
        push(x), push(t);
        if((x->ch[1-b]=t->ch[b]))t->ch[b]->p=x;
        t->ch[b]=x,x->p=t;
        update(x);update(t);
        if((t->p=y)){
            if(y->ch[0]==x)y->ch[0]=t;
            if(y->ch[1]==x)y->ch[1]=t;
            update(y);
        }
    }
    void splay(np t){
        push(t);
        while(!t->is_root()){
            np q=t->p;
            if(q->is_root()){
                push(q), push(t);
                rot(t,q->ch[0]==t);
            }else{
                np r=q->p;
                push(r), push(q), push(t);
                bool b=r->ch[0]==q;
                if(q->ch[1-b]==t)rot(q,b),rot(t,b);
                else rot(t,1-b),rot(t,b);
            }
        }
    }
    void propagate(np t,E x){
        // t->lazy=h(t->lazy,x);
        // t->key=g(t->key,x,1);
        // t->sum=g(t->sum,x,t->sz);
    }
    void set_propagate(np t,E x){
        expose(t);
        propagate(t,x);
        push(t);
    }
    void push(np t){
        // if(t->lazy!=ee){
        //     if(t->ch[0])propagate(t->ch[0],t->lazy);
        //     if(t->ch[1])propagate(t->ch[1],t->lazy);
        //     t->lazy=ee;
        // }
        if(t->rev){
            if(t->ch[0])toggle(t->ch[0]);
            if(t->ch[1])toggle(t->ch[1]);
            t->rev=0;
        }
    }
    np expose(np t){
        np rp=nullptr;
        for(np cur=t;cur;cur=cur->p){
            splay(cur);
            if(cur->ch[1]){
                // toggle(cur->ch[1]);
                // push(cur->ch[1]);
                // cerr<<"+"<<cur->ch[1]->subtree_sum2<<endl;
                // cerr<<cur->rake_node.all_sum()<<endl;
                // cerr<<"+"<<cur->ch[1]->id_sum<<endl;
                cur->rake_node_id_sum^=cur->ch[1]->id_sum;
                cur->rake_node.insert(cur->ch[1]->id_sum,cur->ch[1]->subtree_sum2);
                // cerr<<cur->rake_node.all_sum()<<endl;
            }
            cur->ch[1]=rp;
            if(cur->ch[1]){
                cur->ch[1]->p=cur;
                // cerr<<"-"<<cur->ch[1]->subtree_sum2<<endl;
                // cerr<<cur->rake_node.all_sum()<<endl;
                // cerr<<"-"<<cur->ch[1]->id_sum<<endl;
                push(cur->ch[1]);
                cur->rake_node_id_sum^=cur->ch[1]->id_sum;
                cur->rake_node.erase(cur->ch[1]->id_sum);
                // cerr<<cur->rake_node.all_sum()<<endl;
            }
            update(cur);
            rp=cur;
        }
        splay(t);
        return rp;
    }
    vector<int>get_path(np x){
        vector<int>vs;
        auto dfs=[&](auto dfs,np cur){
            if(!cur)return;
            dfs(dfs,cur->ch[1]);
            vs.push_back(cur->key);
            dfs(dfs,cur->ch[0]);
        };
        expose(x);
        dfs(dfs,x);
        return vs;
    }
    void link(np ch,np par){
        expose(ch);
        expose(par);
        ch->p=par;
        par->ch[1]=ch;
        update(par);
    }
    void cut(np ch){
        expose(ch);
        np par=ch->ch[0];
        ch->ch[0]=nullptr;
        par->p=nullptr;
        update(ch);
    }
    void toggle(np t){
        assert(t);
        swap(t->ch[0],t->ch[1]);
        swap(t->subtree_sum,t->subtree_sum_rev);
        swap(t->subtree_sum2,t->subtree_sum2_rev);
        t->rev^=1;
    }
    void evert(np t){
        expose(t);
        toggle(t);
        push(t);
    }
    np get_root(np x){
        expose(x);
        while(x->ch[0]){
            push(x);
            x=x->ch[0];
        }
        return x;
    }
    public:
    link_cut(int sz,Compress comp=Compress(),Rake rake=Rake(),Rev rev=Rev(),T et=T(),E ee=E()):compress(comp),rake(rake),rev(rev),et(et),ee(ee){
        p.resize(sz,nullptr);
        for(int i=0;i<sz;i++)p[i]=new node(i,et,rake);
    }
    link_cut(){}
    void set_val(int t,T val) {
        expose(p[t]);
        p[t]->val=val;
        update(p[t]);
    }
    T get_val(int t) {
        return p[t]->val;
    }
    vector<int> get_path(int s,int t){
        evert(p[s]);
        return get_path(p[t]);
    }
    void path_add(int s,int t,E x){
        evert(p[s]);
        set_propagate(p[t],x);
    }
    T get_path_sum(int s,int t){
        evert(p[s]);
        expose(p[t]);
        return p[t]->path_sum;
    }
    //tを根としたsの部分木の和を得る
    T get_subtree_sum(int s,int t){
        evert(p[t]);
        expose(p[s]);
        return p[s]->subtree_sum;
    }
    void make_node(T x){
        p.emplace_back(new node(p.size(),x));
    }
    void evert(int t){
        evert(p[t]);
    }
    void link(int s,int t){
        evert(p[s]);
        link(p[s],p[t]);
    }
    void cut(int s,int t){
        evert(p[s]);
        cut(p[t]);
    }
    bool same(int s,int t){
        return get_root(p[s])==get_root(p[t]);
    }
    np lca(int s,int t){
        if(get_root(p[s])!=get_root(p[t]))return nullptr;
        expose(p[s]);
        return expose(p[t]);
    }
};

int main(){
    lint n;
    cin>>n;
    vec a(n);
    rep(i,n)a[i]=i;
    struct data{
        bool zero;
        int pos;
        int far;
        // それぞれ l/rの最遠点までのパスにr/lを含むか
        bool flag;
        // 通る場合 そのパスにおける r/l の子のノード
        int ch;
    };
    auto dif=[&](int x){
        return x==-1?-1:a[x];
    };
    auto compress=[&](const data& s,const data& t){
        if(s.zero)return t;
        if(t.zero)return s;
        data res;
        if(s.flag&&dif(s.ch)<dif(t.pos)){
            res.pos=s.pos;
            res.far=t.far;
            res.flag=t.flag;
            res.ch=t.ch;
        }else{
            res.pos=s.pos;
            res.far=s.far;
            res.flag=0;
            res.ch=-1;
        }
        return res;
    };
    auto rake=[&](const data& s,const data& t){
        if(s.zero)return t;
        if(t.zero){
            data res=s;
            res.flag=1;
            res.ch=s.pos;
            return res;
        }
        if(dif(s.pos)<dif(t.pos)){
            return t;
        }
        else{
            data res=s;
            res.flag=0;
            res.ch=-1;
            return res;
        }
    };
    auto rev=[&](const data& s){return s;};
    const data zero=data{1,0,0,0,0};
    link_cut<data,tuple<>,decltype(compress),decltype(rake),decltype(rev)>lc(n,compress,rake,rev,zero);
    for(int i=0;i<n;++i){
        lc.set_val(i,data{0,i,i,1,-1});
    }
    rep(i,n-1){
        lint s,t;
        cin>>s>>t;
        s--;t--;
        lc.link(s,t);
    }
    lint q;
    cin>>q;
    lint pre=0;
    while(q--){
        lint s,t;
        cin>>s>>t;
        s--;t--;
        s=(s+pre)%n;
        t=(t+pre)%n;
        // cerr<<s<<" "<<t<<endl;
        int tmp=a[t];
        lc.expose(lc.p[t]);
        a[t]=a[s];
        lc.update(lc.p[t]);
        lc.expose(lc.p[s]);
        a[s]=tmp;
        lc.update(lc.p[s]);
        // cerr<<lc.p[s].ch[1]<<endl;
        // cerr<<lc.get_subtree_sum(s,s).far<<lc.get_subtree_sum(s,s).flag<<endl;
        cout<<(pre=lc.get_subtree_sum(s,s).far+1)<<endl;
    }
}