// No.113 宝探し
// https://yukicoder.me/problems/no/113
//

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

double solve(string &S);


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

    double ans = solve(S);
    cout << fixed << setprecision(5) << ans << endl;
}

double solve(string &S) {
    int x = 0;
    int y = 0;

    for (char s: S) {
        switch (s) {
            case 'N':
                y--;
                break;
            case 'E':
                x++;
                break;
            case 'W':
                x--;
                break;
            case 'S':
                y++;
                break;
        }
    }
    return sqrt(x*x + y*y);
}