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

int main(){
	string str;
	cin >> str;
	sort(str.begin(),str.end());
	int e = 0,n = 0,s = 0,w = 0;
	for(int i = 0; i < str.size(); i++){
		if(str[i] == 'E') e++;
		if(str[i] == 'N') n++;
		if(str[i] == 'S') s++;
		if(str[i] == 'W') w++;
	}
	double tate = abs(n-s);
	double yoko = abs(e-w);
	cout << sqrt(tate*tate + yoko*yoko) << endl;
	return 0;
}