#include <bits/stdc++.h>
using namespace std;
#define rep(i,a,b) for(LL i = a;i<b; i++)
#define rrep(i,a,b) for(LL i = a;i>b; i--)
#define INF ((1LL<<62)-(1LL<<31))
#define ooki 9,223,372,036,854,775,807
#define tii -9,223,372,036,854,775,808
typedef long long LL;
int main(){
 LL a,b,c,d,e,f;
  cin >>a>>b>>c>>d>>e>>f;
  if((a%2+c%2+e%2)%2==0){cout<<":-)"<<endl;}
  else cout << ":-("<<endl;
}