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