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


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

	double x, y;
	x=y=0;
	for (int i = 0; i < s.length(); 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));

}