#include<bits/stdc++.h>
#define rep(i, x) for(ll i = 0; i < x; i++)
#define rep2(i, x) for(ll i = 1; i <= x; i++)
#define all(a) (a).begin(),(a).end()
using ll = long long;
using ld = long double;
using namespace std;
signed main() {
    ll a, b, c, d, e, f, cnt = 0; cin >> a >> b >> c >> d >> e >> f;
	if (a % 2 == 0) { cnt++; }
	if (c % 2 == 0) { cnt++; }
	if (e % 2 == 0) { cnt++; }
	if (cnt % 2 == 1) { cout << ":-)\n"; }
	else { cout << ":-(\n"; }
	return 0;
}