perform test 3 sol1

#include<stdio.h>
int main()
{
    int n,a,b,i;
    while(scanf("%d",&n)==1)
 {
     for(i=0;i<n;i++)
     {
         scanf("%d %d",&a,&b);
         printf("%d \n",a%b);
     }
 }
 return 0;
}