#include <bits/stdc++.h>
#define rep(i,n) for (int i=0; i<(n); ++i)
using namespace std;
using ll=long long;
int main(){
    int a1,a2,a3,b1,b2,b3;
    cin>>a1>>b1>>a2>>b2>>a3>>b3;
    int sum=a1+a2+a3;
    if(sum%2==0)cout<<":-)"<<endl;
    else cout<<":-("<<endl;
}