#include <bits/stdc++.h>
using namespace std;

int main()
{
	string S;
	cin >> S;

	int x = 0;
	int y = 0;
	for( int i = 0; i < S.size(); i++ ) {
		if( S[i] == 'N' ) y++;
		else if( S[i] == 'E' ) x++;
		else if( S[i] == 'W' ) x--;
		else y--;
	}
	double ans = sqrt( (double)( x * x + y * y ) );

	cout << fixed << setprecision(12) << ans << endl;
}