#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
int main(){
  int am = 0;
  for(int i = 0; 3 > i; i++){
    int a,b;cin>>a>>b;
    if(a%2)am++;
  }
  if(am%2==0)cout << ":-)" << endl;
  else cout << ":-(" << endl;
}