#include <iostream>
using namespace std;
int gcd(int a, int b)
{
return b ? gcd(b, a % b) : a; //辗转相除法
}
int main()
{
int n;
scanf("%d", &n);
while (n -- )
{
int a, b;
scanf("%d%d", &a, &b);
printf("%d\n", gcd(a, b));
}
return 0;
}