#include <iostream>
#include <cstdio>
#include <vector>
#include <algorithm>
#include <utility>
#include <string>
#include <cmath>

using namespace std;

int main() {
	string s;

	cin >> s;
	vector<int> vec(26, 0);

	for (int i = 0; i < s.size(); i++) {
		vec[s[i] - 'A']++;
	}

	double ans = pow(vec['N' - 'A'] - vec['S' - 'A'], 2) +
	             pow(vec['E' - 'A'] - vec['W' - 'A'], 2);
	ans = sqrt(ans);
	cout << ans << endl;
	return 0;
}