#include <cstdlib>
#include <iomanip>
#include <iostream>
#include <map>

using namespace std;

map<string, double> defaultAngles;

double getAngle(string s) {
  if (s.size() <= 2) {
    return defaultAngles[s];
  }

  double x = getAngle(s.substr(1));
  double y = defaultAngles[s.substr(0, 1)];

  if (s.substr(s.size() - 2, 2) == "NW") {
    if (y == 0)
      y = 360;
  }

  return (x + y) / 2;
}

int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr);

  cout << fixed << setprecision(8);

  defaultAngles["N"] = 0;
  defaultAngles["E"] = 90;
  defaultAngles["S"] = 180;
  defaultAngles["W"] = 270;

  defaultAngles["NE"] = 45;
  defaultAngles["SE"] = 135;
  defaultAngles["SW"] = 225;
  defaultAngles["NW"] = 315;

  string s, t;
  cin >> s >> t;

  double angleS = getAngle(s);
  double angleT = getAngle(t);

  if (abs(angleS - angleT) < 180) {
    cout << abs(angleS - angleT) << endl;
  } else {
    cout << 360 - abs(angleS - angleT) << endl;
  }
}