#include <iostream> #include <vector> #include <string> #include <algorithm> #include <cstdio> #include <cstring> #include <cmath> using namespace std; using ll = long long; int main() { int n = 3; int r = 0; for (int i = 0; i < n; i++) { int a, b; cin >> a >> b; r += a; r %= 2; } cout << (r == 0 ? ":-)" : ":-(") << endl; return 0; }