#include<iostream>
#include<string>
#include<math.h>
using namespace std;

int main()
{
	string s;
	int l, n = 0, e = 0, i;
	float ans;
	cin >> s;
	l = s.length();
	for (i = 0; i < l; i++) {
		switch (s[i]) {
		case 'N':
			n++;
			break;
		case 'E':
			e++;
			break;
		case 'W':
			e--;
			break;
		case 'S':
			n--;
			break;
		}
	}
	ans = sqrt(n*n + e*e);
	cout << ans << endl;
	return 0;
}