#include <bits/stdc++.h>
using namespace std;

int main(){
	ios::sync_with_stdio(false);
	cin.tie(0);  
	string s;
	cin >> s;
	double x = 0, y = 0;
	for(int i = 0; i < s.size(); i++) {
		if(s[i] == 'N') y++;
		if(s[i] == 'E') x++;
		if(s[i] == 'W') x--;
		if(s[i] == 'S') y--;
	}
	cout << setprecision(20) << (double)sqrt(x * x + y * y) << '\n';
	return 0;	
}