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

int main() {
    int a = 0, b = 0;
    string s;
    cin >> s;
    for (const auto &c : s) {
        a += (c == 'N');
        a -= (c == 'S');
        b += (c == 'W');
        b -= (c == 'E');
    }
    
    double ans = sqrt((double)a * a + b * b);
    cout << ans << '\n';
    return 0;
}