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

int main() {
  string S;
  cin >> S;
  int x = 0, y = 0;
  for (size_t i = 0; i < S.size(); ++i) {
    if (S[i] == 'E') {
      ++x;
    } else if (S[i] == 'W') {
      --x;
    } else if (S[i] == 'N') {
      ++y;
    } else {
      --y;
    }
  }
  cout << fixed << sqrt(x * x + y * y) << endl;
}