#include <iostream>
#include <vector>
#include <map>
#include<string>
#include<algorithm>
#include<math.h>
#define ll long long
using namespace std;
int main() {
    ll a,b,c,d,e,f,ans;
    cin>>a>>b>>c>>d>>e>>f;
    ans=pow(a,b)+pow(c,d)+pow(e,f);
    if(ans%2==0) cout<<":-)"<<endl;
    else cout<<":-("<<endl;;
    return 0;
}