#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;
}