#include<bits/stdc++.h>
using namespace std;
#define INIT  ios_base :: sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
#define mp make_pair
#define pb push_back
#define ft first
#define sc second
#define ll long long
#define pii pair<int, int>
#define count_bits __builtin_popcount
#define int ll


int t, n, m, k, a[300010], q, l, r;


ifstream fin("euclid2.in"); ofstream fout("euclid2.out");
#define cin fin
#define cout fout


int gcd(int a, int b){
    if(b==0){
        return a;
    }
    else{
        return gcd(b, a%b);
    }
}



int32_t main(){
INIT


cin>>t;
while(t--){
    int a, b;
    cin>>a>>b;
    cout<<gcd(max(a, b), min(a, b))<<"\n";
}


return 0;
}