#include <iostream>
#include <string>
#include <cmath>
using namespace std;
int main() {
	//dir[i]   i = 0 : N  i = 1 : E  i = 2 : W  i = 3 : S
	int dir[4] = { 0 };
	double x, y;
	string S;
	cin >> S;
	for (int i = 0; i < S.length(); i++) {
		if (S[i] == 'N') {
			dir[0]++;
		}
		else if(S[i] == 'E') {
			dir[1]++;
		}
		else if (S[i] == 'W') {
			dir[2]++;
		}
		else if (S[i] == 'S') {
			dir[3]++;
		}
	}
	x = dir[0] - dir[3]; y = dir[1] - dir[2];
	cout << hypot(x, y) << endl;
	return 0;
}