#include<iostream>
#include<cmath>
#include<iomanip>
using namespace std;
int main(void)
{
	int i, n = 0, e = 0;
	double ans;
	char s[105];

	cin >> s;
	for (i = 0; s[i] != '\0'; i++) {
		if (s[i] == 'N')n++;
		else if (s[i] == 'S')n--;
		else if (s[i] == 'E')e++;
		else e--;
	}
	ans = (double)sqrt(n*n + e*e);
	cout << fixed << setprecision(5) << ans << endl;


	return 0;
}