#include <iostream>

using namespace std;

string s;

bool checkIsEven(char c, int len){

   if(c == '\0')

       return len % 2 == 0;

   return checkIsEven((*(s.begin()+len+1)), len + 1);

}

int main(){

   cin >> s;

   checkIsEven(*s.begin(), 0) ? cout << "Even" : cout << "Odd";

}