#include<iostream>
#include<algorithm>
#include<cmath>
#include<iomanip>
#include<vector>
#include<map>
using namespace std;
typedef long long ll;
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;
  }
}