#include<iostream>
using namespace std;
int main()
{
	float a,b;
	cin >> b;
	if (b == 999){
		cout << "End of Output " << endl;
		return 0;
	}
	while (cin >> a)
	{
		if (a == 999){
			cout << "End of Output " << endl;
			break;
		}
		printf("%.2lf\n",a-b);
		b = a;
		
	}
	return 0;
}