#include<bits/stdc++.h>
using namespace std;
using Int = long long;
template<typename T1,typename T2> inline void chmin(T1 &a,T2 b){if(a>b) a=b;}
template<typename T1,typename T2> inline void chmax(T1 &a,T2 b){if(a<b) a=b;}

//INSERT ABOVE HERE
signed main(){
  Int odd=0;
  for(Int i=0;i<3;i++){
    Int a,b;
    cin>>a>>b;
    if(a&1) odd++;
  }
  if(odd&1) cout<<":-("<<endl;
  else cout<<":-)"<<endl;
  return 0;
}