#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0;i<(int)(n);i++)
template<class T> inline bool chmax(T&a,T b){if(a<b){a=b;return 1;}return 0;}
template<class T> inline bool chmin(T&a,T b){if(a>b){a=b;return 1;}return 0;}
using ll = long long;

int x;
int a[110];

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

    rep(i,6) cin >> a[i];
    rep(i,6)if(i%2==0) x^=a[i]%2;
    cout << (x ? ":-(" : ":-)") << endl;
}