#include <iostream>
#include <cstdio>
using namespace std;
int euclid(int a,int b)
{
    while(b!=0)
    {
        int r;
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}
int main()
{
    freopen("euclid2.in","r",stdin);
    freopen("euclid2.out","w",stdout);
    int a,b,n;
    scanf("%d",&n);
    for(int i=1; i<=n; i++)
    {
        scanf("%d%d",&a,&b);
        printf("%d\n",euclid(a,b));
    }

    return 0;
}