int T, A, B;   
  
int gcd(int A, int B)   
{   
    if (!B) return A;   
    if (A > B) return gcd(A-B, B);   
    return gcd(A, B-A);   
}   
  
int main(void)   
{   
    freopen("euclid2.in", "r", stdin);   
    freopen("euclid2.out", "w", stdout);   
       
    for (scanf("%d", &T); 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;
    if (A > B) return gcd(A-B, B);
    return gcd(A, B-A);
}

int main(void)
{
    freopen("euclid2.in", "r", stdin);
    freopen("euclid2.out", "w", stdout);
    
    for (scanf("%d", &T); T; --T)
    {
        scanf("%d %d", &A, &B);
        printf("%d\n", gcd(A, B));
    }
    
    return 0;
}