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

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