#include <bits/stdc++.h>
#define For(i, a, b) for(long long i = a; i < b; i++)
#define rep(i, n) For(i, 0, n)
#define rFor(i, a, b) for(long long i = a; i >= b; i--)
#define ALL(v) (v).begin(), (v).end()
#define rALL(v) (v).rbegin(), (v).rend()
using namespace std;

using lint = long long;
using ld = long double;

int INF = 2000000000;
lint LINF = 1000000000000000000;

int main() {
    string s;
    cin >> s;
    ld x = 0, y = 0;
    for (char c : s) {
        if (c == 'N') {
            y++;
        } else if (c == 'E') {
            x++;
        } else if (c == 'W') {
            x--;
        } else {
            y--;
        }
    }
    cout << fixed << setprecision(10) << sqrt(x * x + y * y) << endl;
}