#include<bits/stdc++.h>
using namespace std;
int main(){
    int a,b,c,d,e,f;
    cin >> a >> b >> c >> d >> e >> f;
    int sum=0;
    sum+=a%2+c%2+e%2;
    if(sum%2){
        cout << ":-(" << endl;
    }
    else{
        cout << ":-)" << endl;
    }
}