import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String s = sc.next();
    int x = 0;
    int y = 0;
    for(int i = 0; i < s.length(); i++) {
      if(s.charAt(i) == 'N') y++;
      if(s.charAt(i) == 'E') x++;
      if(s.charAt(i) == 'W') x--;
      if(s.charAt(i) == 'S') y--;
    }
    double ans = Math.sqrt(x * x + y * y);
    System.out.println(ans);
  }
}