#include <bits/stdc++.h>

using namespace std;

typedef unsigned long long ull;
typedef long long ll;

int main(){
	int t=0;
	for(int i=0; i<3; i++){
		ll a, b;
		cin >> a >> b;
		t+=a%10;
	}
	if(t%2==0) cout << ":-)" << endl;
	else cout << ":-(" << endl;
	return 0;
}