#include <iostream>
#include <iomanip>
#include <cmath>
using namespace std;
int main(void) {
	string s;
	cin >> s;
	double x = 0, y = 0;
	for (int i = 0; i < s.size(); ++i) {
		if (s[i] == 'N') ++y;
		else if (s[i] == 'E') ++x;
		else if (s[i] == 'W') --x;
		else if (s[i] == 'S') --y;
	}
	double ans = x * x + y * y;
	ans = sqrt(ans);
	cout << fixed << setprecision(10) << ans << endl;
	return 0;
}