#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
signed main() {
  ios::sync_with_stdio(false); cin.tie(0);
  int res = 0;
  for (int i = 0; i < 3; i++) {
    int a, b;
    cin >> a >> b;
    res += a % 2;
  }
  if (res % 2) {
    cout << ":-(\n";
  } else {
    cout << ":-)\n";
  }
  return 0;
}