#include <bits/stdc++.h>

using namespace std;

int main()
{
    double x = 0, y = 0;

    string s; cin >> s;

    for (char &c : s) {
        if (c == 'N') x--;
        if (c == 'E') y--;
        if (c == 'W') y++;
        if (c == 'S') x++;
    }

    cout << sqrt(x*x + y*y) << endl;
}