#include <bits/stdc++.h>
using namespace std;
ifstream in("euclid2.in");
ofstream out("euclid2.out");

int cmmdc(int a,int b)
{
    int c;
    while (b)
    {
        c = a % b;
        a = b;
        b = c;
    }
    return a;
}

int main()
{
    int n,a,b;
    in>>n;
    for(int i=0;i<n;i++)
    {
        in>>a>>b;
        out<<cmmdc(a,b)<<'\n';
    }

}