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

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

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

	printf("%.10f\n", sqrt(x * x + y * y));
	return 0;
}