#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; 
}