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

using namespace std;

int main()
{
	vector<int> cnt(26, 0);
	string S;
	cin >> S;
	for( int i = 0; i < S.size(); i++ ) {
		cnt[S[i]-'A'] ++;
	}

	double x, y;
	x = abs( cnt['N'-'A'] - cnt['S'-'A'] );
	y = abs( cnt['W'-'A'] - cnt['E'-'A'] );
	cout << sqrt( x * x + y * y ) << endl;
	
	return 0;
}