#include <stdio.h>

int T;

int euclid(int a, int b){
	int r;

	while(b){
		r = a % b;
		a = b;
		b = r;
	}

	return a;
}

int main(){
	freopen("euclid2.in", "r", stdin);
	freopen("euclid2.out", "w", stdout);
	int a, b;

	scanf("%d", &T);
	for(int i = 0; i < T; ++i){
		scanf("%d %d", &a, &b);
		printf("%d\n", euclid(a, b));
	}
	return 0;
}