杭电oj2003

#include<iostream>
#include<iomanip>
using namespace std;
int main()
{
double a;
while(cin>>a)
{
if(a>=0)
cout<<setiosflags(ios::fixed)<<setprecision(2)<<a<<endl;
else
cout<<setiosflags(ios::fixed)<<setprecision(2)<<-a<<endl;
}
return 0;
}