#include<stdio.h>
 
int main()
{
    int n, a, b, c, i;
    freopen("euclid2.in", "r", stdin);
    freopen("euclid2.out", "w", stdout);
     
    scanf("%d", &n);
    for(i = 0;i < n; i++)
    {
        scanf("%d %d", &a, &b);
        while (b != 0)
        {
            c = b;
            b = a%b;
            a = c;
        }
        printf("%d\n", a);
    }
}