#include <iostream>
#include <algorithm>
using namespace std;

int main(){
    long a, b, c, d, e ,f, g;
    cin >> a >> b >> c >> d >> e >> f;
    g = a + b + c;
    string ans = ":-(";
    if ( g % 2 == 0 ) ans = ":-)";
    cout << ans << endl;
    
    return 0;
}