#include <stdio.h>

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

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