#include <iostream>
#include<ctype.h>
#include<cmath>
#include<iomanip>
using namespace std;

int main()
{
    string n;
    getline(cin,n);
    double a,b,c,d;
    a=0;
    b=0;
    c=0;
    d=0;
    double x,y,z;
    for(int i=0; i<n.size(); i++)
    {
        if(n[i]=='n' && isdigit(n[i+1])==1 && isdigit(n[i+2])==1 )
        {
            a=a+(n[i+1]-'0')*10+(n[i+2]-'0');
        }
        else if(n[i]=='n' && isdigit(n[i+1])==1 )
        {
            a=a+(n[i+1]-'0');
        }
        if(n[i]=='s' && isdigit(n[i+1])==1 && isdigit(n[i+2])==1 )
        {
            b=b+(n[i+1]-'0')*10+(n[i+2]-'0');
        }
        else if(n[i]=='s' && isdigit(n[i+1])==1 )
        {
            b=b+(n[i+1]-'0');
        }
        if(n[i]=='w' && isdigit(n[i+1])==1 && isdigit(n[i+2])==1 )
        {
            c=c+(n[i+1]-'0')*10+(n[i+2]-'0');
        }
        else if(n[i]=='w' && isdigit(n[i+1])==1 )
        {
            c=c+(n[i+1]-'0');
        }
        if(n[i]=='e' && isdigit(n[i+1])==1 && isdigit(n[i+2])==1 )
                {
                    d=d+(n[i+1]-'0')*10+(n[i+2]-'0');
                }
                else if(n[i]=='e' && isdigit(n[i+1])==1 )
                {
                    d=d+(n[i+1]-'0');
                }
            }
            x=a-b;
            y=c-d;
            z=sqrt(pow(a-b,2)+pow(c-d,2));
            cout<<fixed<<setprecision(2)<<z;
            return 0;
        }