#include<iostream>
using namespace std;

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

int main() {
	int T, a, b;

	freopen("euclid2.in", "r", stdin);
    freopen("euclid2.out", "w", stdout);

    scanf("%d", &T);
    for ( ; T > 0; --T) {
    	scanf("%d %d", &a, &b);
    	printf("%d\n", gcd(a, b));
	}

	return 0;
}