#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
#include <cmath>
#include <iomanip>

#define REP(i, a, b) for (int i = int(a); i < int(b); i++)

using namespace std;

typedef long long int lli;

int main() {
    string s;
    cin >> s;
    int x = 0, y = 0;
    REP (i, 0, s.size()) {
        if (s[i] == 'N') y++;
        else if(s[i] == 'E') x++;
        else if(s[i] == 'W') x--;
        else y--;
    }
    cout << fixed << setprecision(10) << hypot(x, y) << endl;
    return 0;
}