#include <bits/stdc++.h>
#define rep(i,n)for(long long i=0;i<(n);i++)
using namespace std;
typedef unsigned long long ull;
typedef long long ll;
const ll INF=1e18;
const int MOD=1e9+7;
const double pi=acos(-1);

int main(){
  int sum=0;
  rep(i,3){
    ll a,b;
    cin >> a >> b;
    sum+=a%2;
  }
  if(sum%2==0)cout<<":-)"<<endl;
  else cout <<":-("<<endl;
}