#include<iostream>
#include<cstdio>
#include<string>
#include<cmath>
using namespace std;
int main(){
    string str;
    double ans;
    int n=0,e=0,w=0,s=0;
    cin >> str;
    for(int i=0;i<str.length();i++){
        switch(str[i]){
            case 'N':n++;break;
            case 'E':e++;break;
            case 'W':w++;break;
            case 'S':s++;break;
        }
    }
    ans = sqrt(pow(n-s,2)+pow(e-w,2));
    cout << ans << endl;
}