#include <bits/stdc++.h>
using namespace std;
struct cww{cww(){ios::sync_with_stdio(false);cin.tie(0);}}star;
int main()
{
	string str;
	cin >> str;

	auto N = count( str.begin(), str.end(), 'N' );
	auto E = count( str.begin(), str.end(), 'E' );
	auto W = count( str.begin(), str.end(), 'W' );
	auto S = count( str.begin(), str.end(), 'S' );

	cout << sqrt( pow( N - S, 2 ) + pow( E - W, 2 ) ) << endl;

	return 0;
}