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

int main(){
  int  a[3];
  int  f[3];
  int ans = 0;
  double b,c,d;
  for(int i=0;i<3;i++){
    cin >> a[i] >> f[i];
    ans +=a[i];
  }
 if(ans%2==0){
   cout << ":-)"<<endl;
 }else{
   cout << ":-("<<endl;
 }
return 0;
}