#include<bits/stdc++.h>
using namespace std;
int gcd(int a, int b) {
  return b != 0 ? gcd(b, a % b) : a;
}
int lcm(int a, int b) {
  return a * b / gcd(a, b);
}
 main() {
vector<long long > a(6);
int che =0;
for(int i=0;i<6;i++){
  cin >> a.at(i);
  if(i==0||i==2||i==4){
    if(a.at(i)%2==0)che++;
  }
}
if(che==1||che==3){
  cout <<":-)"<<endl;
}
else{
  cout <<":-("<<endl;
}
 }