#include <bits/stdc++.h>

using namespace std;

ifstream f("euclid2.in");
ofstream g("euclid2.out");

int n,a,b;

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

int main()
{
    int i;
    f>>n;
    for(i=1; i<=n; i++)
    {
        f>>a>>b;
        g<<cmmdc(a,b)<<endl;
    }
}