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

int main() {
  int ans = 0;
  for (int i = 0; i < 3; ++i) {
    int A, B;
    cin >> A >> B;
    ans += A & 1;
  }
  if (ans & 1) cout << ":-(" << endl;
  else cout << ":-)" << endl;
  return 0;
}