#include <iostream>
#include <cstdio>
using namespace std;

int euclid(int x,int y)
{
    int r;
    while (y)
    {
        r=x%y;
        x=y;
        y=r;
    }
    return x;
}

int main()
{
    freopen("euclid2.in","r",stdin);
    freopen("euclid2.out","w",stdout);
    int t,a,b;
    scanf("%d",&t);
    for (int i=1;i<=t;++i)
    {
        scanf("%d%d",&a,&b);
        printf("%d\n",euclid(a,b));
    }
    return 0;
}