#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)
    {
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}

int main()
{
    int a, b, n;
    fin >> n;
    for(int i=1;i<=n;i++)
    {
        fin >> a >> b;
        fout << cmmdc(a, b) << "\n";
    }
    return 0;
}