#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for(int (i) = 0; (i) < (n); (i)++)
#define repe(i, n) for(i = 0; i <= (n); i++)
typedef long long ll;

int main()
{
    vector<int> a(3);
    int b1, b2, b3;
    int odd = 0, even = 0;
    cin >> a[0] >> b1 >> a[1] >> b2 >> a[2] >> b3;
    rep(i, 3){
        if(a[i] % 2 == 0)even++;
        else odd++;
    }
    if(odd % 2 == 0)cout << ":-)" << endl;
    else cout << ":-(" << endl;
    return 0;
}