#include <iostream>
#include <string>
#include <cmath>
#include <iomanip>
using namespace std;
using ll = long long;

int main() {
    string s;
    cin >> s;
    int x=0, y =0;
    for(int i=0; i<s.size(); ++i) {
        if(s[i] == 'E') {
            x++;
        } else if(s[i] == 'W') {
            x--;
        } else if(s[i] == 'S') {
            y++;
        } else {
            y--;
        }
    }
    cout << fixed << setprecision(10) << hypot(x, y) << endl;
}