#include <bits/stdc++.h>

using namespace std;

int main() {
    string s;
    cin >> s;

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

    cout << fixed << setprecision(8);
    cout << hypot(x, y) << endl;
    return 0;
}