#include<iostream>
#include<vector>
using namespace std;

int main()
{
    vector<int> a(3);
    vector<int> b(3);
    int asum=0;
    for (int i ; i<3;i++) {
        cin>>a[i]>>b[i];
        asum+=a[i];
    }
    if(asum%2==0)
    {
        cout<<":-)"<<endl;
    }
    else
    {
        cout<<":-("<<endl;   
    }
}