/*
    https://yukicoder.me/problems/no/892
*/
#include <bits/stdc++.h>
using namespace std;

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);

    int even = 0;
    int a, b;

    for (int i = 0; i < 3; i++) {
        cin >> a >> b;
        if (a % 2 == 0)
            even += 1;
    }
    // cerr << even << endl;

    if (even % 2 != 0)
        cout << ":-)" << endl;
    else
        cout << ":-(" << endl;
}