#include <bits/stdc++.h>

using namespace std;

int main() {
	string s; cin >> s;
	int x = 0, y = 0;
	for (int i = 0; i < s.size(); ++i) {
		switch (s[i]) {
			case 'N': ++y; break;
			case 'S': --y; break;
			case 'E': ++x; break;
			case 'W': --x; break;
		}
	}
	cout << fixed << setprecision(10) << sqrt(x*x+y*y) << endl;
}