#include <bits/stdc++.h>

using namespace std;
ifstream fin ("euclid2.in");
ofstream fout ("euclid2.out");
int euclid (int a , int b){
    int r;
    while (b != 0){
        r = a % b;
        a = b;
        b = r;
    }
    return a;
}
int main()
{
    int t , a , b;
    fin >> t;
    while (t --){
        fin >> a >> b;
        fout << euclid (a , b) << '\n';
    }
    return 0;
}