#include <iostream>
#include <cmath>
#include <stack>
using namespace std;

int main()
{
    stack <unsigned long long> __stack_sqrt;
    unsigned long long ent_val;

    while(cin >> skipws >> ent_val)
        __stack_sqrt.push(ent_val);

    cout.setf(ios::showpoint);
    cout.precision(5);
    while(!(__stack_sqrt.empty()))
    {

        cout << sqrt(__stack_sqrt.top()) << endl;
        __stack_sqrt.pop();
    }

    return 0;
}

Compilator wrote "wrong answer", but when i've test it, everything is ok! Please help smb, what's th problem?