#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define all(x) (x).begin(),(x).end()
const int mod=1000000007,MAX=100005;
const ll INF=1LL<<60;

int main(){

    int a,b,c,d,e,f;cin>>a>>b>>c>>d>>e>>f;
    if(a%2==0||c%2==0||e%2==0) cout<<":-)"<<endl;
    else cout<<":-("<<endl;
}