#include <bits/stdc++.h>
#define INF 990000000
//10
using namespace std;

int main() {
long long int ts=0;
long long int s,t;
for(int i=0;i<3;i++){
cin>>s>>t;
if(s%2==0)
ts+=0;
else
ts+=1;

}

if(ts%2==0)
cout<< ":-)"<<endl;
else
cout<< ":-("<<endl;


}