#include<bits/stdc++.h>
#include <atcoder/all>
#ifdef LOCAL
#include <debug_print.hpp>
#define debug(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#define debug(...) (static_cast<void>(0))
#endif
using namespace atcoder;
using mint=modint998244353;
using namespace std;
using ll=long long;
using ul=unsigned long long;
int dx[8] = {-1, 1, 0, 0, -1, -1, 1, 1};
int dy[8] = {0, 0, -1, 1, -1, 1, -1, 1};
using Graph=vector<vector<int>>;
ll op(ll a,ll b){return min(a,b);}
ll e(){return 2e9;}
ll inv(ll a,ll m){
    ll mod=m,u=1,v=0;
    while(mod){
        ll t=a/mod;
        a-=t*mod;swap(a,mod);
        u-=t*v;swap(u,v);
    }
    u%=m;
    if(u<0)u+=m;
    return u;
}
int main(){
    int T;
    cin>>T;
    while(T--){
        ll A,P;
        cin>>A>>P;
        bool ok=false;
        if(P==1){cout<<-1<<endl;continue;}
        if(P==2){cout<<A%2<<endl;continue;}
        if(P==3){cout<<1<<endl;continue;}
        for(int i=2;i*i<=P;i++)if(P%i==0){cout<<-1<<endl,ok=true;break;}
        if(ok)continue;
        ll t=(P-2)*(P-1)/2-1;
        ll cnt=A%P,ans=1;
        while(t){
            cnt%=P;
            if((t>>0)&1)ans*=cnt,ans%=P;
            t=t>>1;
            cnt*=cnt;
        }
        cout<<inv(ans,P)%P<<endl;
    }
}