Why wrong answer???
#include <iostream>
#include <cmath>
#include <sstream>
#include <vector>
#include <iomanip>
using namespace std;
int main()
{
    double ans;
    string s;
    vector <double> vect;
    int i;
    i=0;
    while(cin>>s){
    stringstream ss;
    ss<<s;
    ss>>ans;
    vect.push_back(sqrt(ans));

}
for(int i=vect.size();i>=0;i--)
cout<<setprecision(5)<<vect[i]<<endl;
return 0;
}