POJ 2871

#include<iostream>
#include<stdio.h>
#include<iomanip>
using namespace std;

int main()
{
	//freopen("acm.acm","r",stdin);
	double tem1;
	double tem2;
	cin>>tem1;
	while(cin>>tem2)
	{
		if(tem2 == 999)
			break;
		cout<<setiosflags(ios::fixed)<<setprecision(2)<<tem2-tem1<<endl;
		tem1 = tem2;
	}
	cout<<"End of Output"<<endl;
}