#include<iostream>
#include<string>
#include<cmath>

int main(){
	std::string s;
	std::cin >> s;
	double x = 0, y = 0;
	for (int i = 0; i < s.size(); ++i){
		if (s[i] == 'S')y--;
		if (s[i] == 'N')y++;
		if (s[i] == 'E')x++;
		if (s[i] == 'W')x--;
	}
	std::cout << sqrt(x*x + y*y) << std::endl;
	return 0;
}