大水
#include <iostream>
#define eps 1e-8
using namespace std;
int main()
{
//freopen("input.txt", "r", stdin);
double n,m;
cin>>n;
while( cin>>m ) {
//if( m == 999 )
if( 999-m<eps )
break;
printf("%.2f\n",m-n);
n=m;
}
cout<<"End of Output"<<endl;
return 0;
}