#include <iostream>
#include <cmath>
using namespace std;

int main() {
    int x = 0, y = 0;
    string s;
    cin >> s;
    for (char c : s) {
        if (c == 'N')
            y++;
        else if (c == 'E')
            x++;
        else if (c == 'W')
            x--;
        else if (c == 'S')
            y--;
    }
    double ans = sqrt(x * x + y * y);
    cout << ans << endl;
    return 0;
}