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


int main(){
	string S;
	cin >> S;
	int x = 0, y = 0;
	for (char C : S){
		switch (C){
		case 'N':
			y++;
			break;
		case 'E':
			x++;
			break;
		case 'W':
			x--;
			break;
		case 'S':
			y--;
			break;

		}
	}
	printf("%.14f\n", hypot(x, y));
}