#include <bits/stdc++.h>
using namespace std;

int main() {
    string s;
    cin >> s;
    int n = 0, e = 0;
    for (int i = 0; i < s.size(); i++) {
        switch (s.at(i)) {
            case 'N': n++; break;
            case 'S': n--; break;
            case 'E': e++; break;
            case 'W': e--; break;
        }
    }
    cout << sqrt((double) (n * n + e * e)) << endl;
}