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

int main() {
	std::string direction;
	std::cin >> direction;

	int n = std::count(direction.begin(), direction.end(), 'N');
	int e = std::count(direction.begin(), direction.end(), 'E');
	int w = std::count(direction.begin(), direction.end(), 'W');
	int s = std::count(direction.begin(), direction.end(), 'S');

	int y = abs(n - s);
	int x = abs(e - w);

	double distance = sqrt(pow(x, 2) + pow(y, 2));
	std::cout << distance << std::endl;
	
	return 0;
}