#include "iostream"
#include "math.h"
using namespace std;

char letter[200];
int x, y;
double ans;

int main() {
	cin >> letter;
	for (int i = 0; letter[i] != NULL; i++) {
		if (letter[i] == 'N')y++;
		else if (letter[i] == 'S')y--;
		else if (letter[i] == 'W')x++;
		else x--;
	}
	ans = sqrt(float(x)*float(x) + float(y)*float(y));
	cout << ans << "\n";
	return 0;

}