#include <iostream>
#include <string>
#include <cmath>
using namespace std;

int main()
{
	string S;
	cin >> S;
	int ns = 0, ew = 0;

	for(int i = 0; i < S.length(); ++i)
	{
		if((S[i] == 'N') || (S[i] == 'S'))
		{
			ns += ((S[i] == 'N') ? 1 : -1);
		}
		else
		{
			ew += ((S[i] == 'E') ? 1 : -1);
		}
	}

	cout << sqrt((ns * ns) + (ew * ew)) << endl;
	return 0;
}