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

//Avoid io blocking and 64 bit math
//32 bit mod and div  - OK
inline void printDoubleApprox(double In)
{
    int beforepoint = (int)(In);
    int afterpoint = (int)((In-beforepoint)* 10000);

    char buf[10], *p = buf;
    do
    {
        *p++ = '0' + beforepoint % 10;
        beforepoint /= 10;
    }
    while (beforepoint);

    do
    {
        _putchar_nolock(*--p);
    }
    while (p > buf);

    _putchar_nolock('.');
    _putchar_nolock('0' + (afterpoint%10000)/1000);
    _putchar_nolock('0' + (afterpoint%1000)/100);
    _putchar_nolock('0' + (afterpoint%100)/10);
    _putchar_nolock('0' + (afterpoint%10));
    _putchar_nolock('\n');
}

int main()
{
    //char * inpt = new char[256*1024];
    //Stack allock = faster
    char inpt[256*1024];
    int indx=0;
    indx = fread(inpt,1,256*1024,stdin);
    bool valIn = false;
    long long mult = 1;
    long long val = 0;
    while(indx--)
    {
        if(inpt[indx] >= '0' && inpt[indx] <='9') //digit
        {
            if(!valIn)
            {
                val = 0;
                mult = 1;
                valIn=true;
            }
            val = val + mult*(inpt[indx]-'0');
            //mult *= 10;
            mult = (mult<<3) + (mult<<1);
        }
        else //invalid char, outputting
        {
            if(valIn)
            {
                valIn = false;
                double v = sqrt((double)val);
                printDoubleApprox(v);
            }
        }
    }
    if(valIn)
    {
        double v = sqrt((double)val);
        printDoubleApprox(v);
    }

    //delete[] inpt;

    return 0;
}