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

    return 0;
}