#include <bits/stdc++.h>

using namespace std;

ifstream fin("euclid2.in");
ofstream fout("euclid2.out");

int cmmdc ( int a, int b ){
    int r;
    while ( b != 0 ){
            r = b;
            b = a % b;
            a = r;
    }
    return a;
}

int T, i, a, b;

int main()
{
    fin >> T;
    for ( i = 1; i <= T; i++ ){
          fin >> a >> b;
          fout << cmmdc(a,b) << endl;
    }
}