#include <bits/stdc++.h>
 
using namespace std;
 
#define DEBUG(x) cerr<<#x<<": "<<x<<endl;
#define DEBUG_VEC(v) cerr<<#v<<":";for(int i=0;i<v.size();i++) cerr<<" "<<v[i]; cerr<<endl;
#define DEBUG_MAT(v) cerr<<#v<<endl;for(int i=0;i<v.size();i++){for(int j=0;j<v[i].size();j++) {cerr<<v[i][j]<<" ";}cerr<<endl;}
typedef long long ll;
// #define int ll
 
#define vi vector<int>
#define vl vector<ll>
#define vii vector< vector<int> >
#define vll vector< vector<ll> >
#define vs vector<string>
#define pii pair<int,int>
#define pis pair<int,string>
#define psi pair<string,int>
#define pll pair<ll,ll>
template<class S, class T> pair<S, T> operator+(const pair<S, T> &s, const pair<S, T> &t) { return pair<S, T>(s.first + t.first, s.second + t.second); }
template<class S, class T> pair<S, T> operator-(const pair<S, T> &s, const pair<S, T> &t) { return pair<S, T>(s.first - t.first, s.second - t.second); }
template<class S, class T> ostream& operator<<(ostream& os, pair<S, T> p) { os << "(" << p.first << ", " << p.second << ")"; return os; }
#define X first
#define Y second
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define rep1(i,n) for(int i=1;i<=(int)(n);i++)
#define rrep(i,n) for(int i=(int)(n)-1;i>=0;i--)
#define rrep1(i,n) for(int i=(int)(n);i>0;i--)
#define REP(i,a,b) for(int i=a;i<b;i++)
#define in(x, a, b) (a <= x && x < b)
#define all(c) c.begin(),c.end()
template<class T> bool chmax(T &a, const T &b) { if (a<b) { a = b; return 1; } return 0; }
template<class T> bool chmin(T &a, const T &b) { if (a>b) { a = b; return 1; } return 0; }
#define UNIQUE(v) v.erase(std::unique(v.begin(), v.end()), v.end());
const ll inf = 1000000001;
const ll INF = (ll)1e18 + 1;
const long double pi = 3.1415926535897932384626433832795028841971L;
#define Sp(p) cout<<setprecision(25)<< fixed<<p<<endl;
// int dx[4] = {1, 0, -1, 0}, dy[4] = {0, 1, 0, -1};
// int dx2[8] = { 1,1,0,-1,-1,-1,0,1 }, dy2[8] = { 0,1,1,1,0,-1,-1,-1 };
vi dx = {1, 0, -1, 0}, dy = {0, 1, 0, -1};
// vi dx2 = { 1,1,0,-1,-1,-1,0,1 }, dy2 = { 0,1,1,1,0,-1,-1,-1 };
#define fio() cin.tie(0); ios::sync_with_stdio(false);
const ll MOD = 1000000007;
// const ll MOD = 998244353;
// #define mp make_pair
//#define endl '\n'

const int N = 212345;
vii G(N);
// vii grundy(N);
// vi grundy2(N, -1);
vector<unordered_map<int, int>> mp(N);
// map<pii, int> mp;
vi first_par(N, -2);
vi gr(N, -2);
vii used(N);

struct dice {
  mt19937 mt;
  dice() : mt(chrono::steady_clock::now().time_since_epoch().count()) {}
  // [0, x)の一様乱数
  ll operator()(ll x) { return this->operator()(0, x); }
  // [x, y)の一様乱数
  ll operator()(ll x, ll y) {
    uniform_int_distribution<ll> dist(x, y - 1);
    return dist(mt);
  }
  vl operator()(int n, ll x, ll y) {
    vl res(n);
    for (int i = 0; i < n; i++) res[i] = this->operator()(x, y);
    return res;
  }
} rnd;

int dfs1(int now, int par) {
    if (mp[now].count(par)) return mp[now][par];
    fill(all(used[now]), 0);
    first_par[now] = par;
    vi temp;
    rep (i, G[now].size()) {
        int v = G[now][i];
        if (v == par) continue;
        int res = dfs1(v, now);
        if (res < used[now].size()) {
            used[now][res]++;
        }
    }
    for (int i = 0; i <= N; i++) {
        if (used[now][i] == 0) {
            mp[now][par] = i;
            gr[now] = i;
            return i;
        }
    }
    assert(false);
}


int calc(int now, int par) {
    if (mp[now].count(par)) return mp[now][par];
    assert(false);
}


void dfs2(int now, int par) {
    if (par != -1) {
        int x = calc(par, now);
        if (x < used[now].size()) {
            used[now][x]++;
        }
        for (int i = 0; i <= N; i++) {
            if (used[now][i] == 0) {
                mp[now][-1] = i;
                gr[now] = i;
                break;
            }
        }
    }

    for (int v: G[now]) {
        if (v == par) continue;
        int x = gr[v];
        // if (x < used[now].size()) used[now][x]--;

        if (x < gr[now] and used[now][x] == 1) {
            mp[now][v] = x;
        }
        else {
            mp[now][v] = gr[now];
        }
        
        // for (int i = 0; i <= N; i++) {
        //     if (used[now][i] == 0) {
        //         mp[now][v] = i;
        //         break;
        //     }
        // }
        // if (x < used[now].size()) used[now][x]++;
    }

    for (int v: G[now]) {
        if (v == par) continue;
        dfs2(v, now);
    }
}

signed main() {
    fio();
    
    int n, m;
    cin >> n >> m;
    vi a(m);
    rep (i, m) {
        cin >> a[i];
        a[i]--;
    }

    rep (i, n - 1) {
        int u, v;
        cin >> u >> v;
        u--; v--;
        G[u].push_back(v);
        G[v].push_back(u);
    }
    rep (i, n) {
        used[i].resize(G[i].size() + 1);
    }
    // rep (i, n) {
    //     grundy[i].resize(G[i].size(), -1);
    // }

    vector<int> gl(m);
    vi idx(m);
    rep (i, m) idx[i] = i;
    std::random_device seed_gen;
    std::mt19937 engine(seed_gen());
    std::shuffle(idx.begin(), idx.end(), engine);

    dfs1(0, -1);
    dfs2(0, -1);

    int x = 0;
    rep (i, m) {
        int j = idx[i];
        gl[j] = calc(a[j], -1);
        x ^= gl[j];
    }

    if (x == 0) {
        cout << -1 << " " << -1 << endl;
        return 0;
    }

    rep (i, m) {
        int y = gl[i];
        rep (j, G[a[i]].size()) {
            int v = G[a[i]][j];
            // int par_idx = mp[v][a[i]];
            // DEBUG(par_idx);
            // int z = grundy[v][par_idx];
            int z = calc(v, a[i]);
            if ((x ^ y ^ z) == 0) {
                cout << i + 1 << " " << v + 1 << endl;
                return 0;
            }
        }
    }
}