#include <stdio.h>

int a, b, t;

int cmmdc(int a, int b)
{
    int r;
    while ( b)
    {
         r = a % b;
         a = b;
         b = r; 
    }
    return a;
}

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