#include <cstdio>

int GCD(int a, int b) {
	if (a % b == 0) {
		return b;
	}
	else {
		return GCD(b, a % b);
	}
}

int main() {
	int a, b;
	while ((scanf("%d%d", &a, &b)) != EOF) {
		printf("%d\n", GCD(a, b));
	}
	return 0;
}