#include <stdio.h> 
int T, A, B;
int gcd(int a, int b)
{
if (!b) return a;
return gcd(b, a % b);
}
int main(void)
{
freopen("euclid2.in", "r", stdin);
freopen("euclid2.out", "w", stdout);
scanf("%d", &T);
for (; T; --T)
{
scanf("%d %d", &A, &B);
printf("%d\n", gcd(A, B));
}       
return 0;
}