#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;   
}  
#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;
}