#include <bits/stdc++.h>

using namespace std;

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

  int x = 0, y = 0;
  for (int i = 0; i < s.size(); i++) {
    x += s[i] == 'E';
    x -= s[i] == 'W';
    y += s[i] == 'N';
    y -= s[i] == 'S';
  }

  printf("%.10f\n", hypot(x, y));

  return 0;
}