#include<stdio.h>
#include<cmath>
#include<vector>

using namespace std;

vector <double> v;

int main()
{    double c;
    while(scanf("%lf",&c) != EOF)    v.push_back(c);

    for(vector <double>::iterator it=v.begin(); it != v.end(); it++)
        printf("%.4lf\n",sqrt(*it));
}

may be
> for(vector <double>::reverse_iterator it=v.rbegin(); it != v.rend(); it++)
>        printf("%.4lf\n",sqrt(*it));
?