Datasets:

slayone
/

uva_spoj_raw

#include <bits/stdc++.h>

using namespace std;

int main(){
   long long a, b;
   while(scanf("%lld %lld", &a, &b) == 2)
      printf("%lld\n", abs(b - a));
   return(0);
}

	#include <bits/stdc++.h>

	using namespace std;

	int main(){
	long long a, b;
	while(scanf("%lld %lld", &a, &b) == 2)
	printf("%lld\n", abs(b - a));
	return(0);
	}