#include <iostream>
#include <cstdio>
#include <iomanip>
#include <cmath>
using namespace std;

#define rep(i,n) for(int i=0;i<n;i++)

int main() {
	char c;
	int x, y;
	x = y = 0;
	while (cin>>c) {
		if (c == 'N') y++;
		else if (c == 'S') y--;
		else if (c == 'E') x++;
		else if (c == 'W') x--;
	}

	cout << fixed << setprecision(3) << sqrt(x*x + y*y) << endl;

	return 0;
}