#include <iostream>
#include <fstream>
using namespace std; 
int euclid(int a,int b)
{
	if (a==0 || b==0)	return (a==0?b:a);
	else
	if (a>b)
		return euclid(b,a%b);
	else return euclid(a,b%a);
}

int T,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", euclid(a, b));
    }  
}