#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < n; ++i)
using ll = long long;
using namespace std;
const int INF = 1e9;

int main() {
    int A[6],cnt=0;
    rep(i, 6) cin >> A[i];

    for (int i = 0; i < 6;i+=2){
        if(A[i]%2==1)
            cnt++;
    }

    cnt % 2 == 0 ? cout << ":-)" : cout << ":-(";
    cout << endl;

    return 0;
}