#include <iostream>
#include <iomanip>
#include <cmath>
using namespace std;

int main() {
	char c;
	int x=0, y=0;

	cin.tie(0);
	ios::sync_with_stdio(false);
	while (cin >> c) {
		if (c == 'N') y++;
		else if (c == 'S') y--;
		else if (c == 'E') x++;
		else if (c == 'W') x--;
	}

	cout << fixed << setprecision(3) << sqrt(x*x + y*y) << endl;

	return 0;
}