#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; 
}