#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <iomanip>
using ll = long long;
using namespace std;
constexpr ll INF = 1LL << 60;

string s;

int main() {
	cin >> s;
	int x = 0, y = 0;
	for (char c : s) {
		if (c == 'N') ++y;
		if (c == 'E') ++x;
		if (c == 'W') --x;
		if (c == 'S') --y;
	}
	cout << fixed << setprecision(10) << sqrt(x * x + y * y) << endl;
	return 0;
}