#include <iostream>
using namespace std;
int main()
{
int numberOfNumvers;
cin >> numberOfNumvers;
long int a, b;
int tmp = numberOfNumvers;
int tmpResult;
while (tmp--)
{
cin >> a;
cin >> b;
if (a < 0)
a = (-1) * a;
if (b < 0)
b = (-1) * b;
cout << a % b << endl;
}
return 0;
}
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