#include <bits/stdc++.h>

using namespace std;

#define REP(i, n) for(int i = 0; i < n; i++)

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);

    string s;
    cin >> s;
    int x = 0, y = 0;
    REP(i, s.length()) {
        switch (s[i]) {
            case 'N':
                y++;
                break;
            case 'E':
                x++;
                break;
            case 'S':
                y--;
                break;
            case 'W':
                x--;
                break;
        }
    }

    cout << fixed << setprecision(3);
    cout << hypot(x, y) << endl;
    return 0;
}