#include<stdio.h>
int cmmdc(int a, int b)
{
    if (!b) return a;
    return cmmdc(b, a % b);
}
int main(void)
{
    int t, a, b;
    freopen("euclid2.in", "r", stdin);
    freopen("euclid2.out", "w", stdout);
    scanf("%d", &t );
    for(; t; --t)
    {
        scanf("%d%d", &a, &b);
        printf("%d \n", cmmdc(a, b));
    }
    return 0;
}