#include <stdio.h>

int t, a, b;

int gcd(int a, int b){
    if (!b) return a;
    return gcd(b, a%b);
}

int main(){
    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;
}