#include <iostream>

using namespace std;

int main() {
  int a1,b1,a2,b2,a3,b3;
  cin >> a1 >> b1 >> a2 >> b2 >> a3 >> b3;
  if ((a1+a2+a3)%2 == 0 ) {
  cout << ":-)" << endl;
  }
  else
  {
  cout << ":-(" << endl;
  };

};