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

int main() {
  string s;
  cin >> s;
  int x = 0, y = 0;
  for (const auto &p : s) {
    if (p == 'N') ++y;
    else if (p == 'E') ++x;
    else if (p == 'W') --x;
    else if (p == 'S') --y;
  }
  printf("%f\n", sqrt(x * x + y * y));
  return 0;
}