#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; 
}