#include <bits/stdc++.h>
using namespace std;
int main() {
	double x = 0, y = 0;
	string S;
	cin >> S;
	for(int i = 0; i < S.length(); i++) {
		switch(S[i]) {
			case 'N': y--; break;
			case 'S': y++; break;
			case 'W': x--; break;
			case 'E': x++; break;
		}
	}
	cout << fixed << setprecision(10) << hypot(x, y) << endl;
	return 0;
}