#include <bits/stdc++.h>
typedef long long int ll;
using namespace std;
int main(void) {
  string S, T;
  cin >> S >> T;
  unsigned long long a = stoull(S, nullptr, 2);
  unsigned long long b = stoull(T, nullptr, 2);
  cout << (a & b & 1 ? "Odd" : "Even") << endl;
}