#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> P;
#define DUMP(x)  cout << #x << " = " << (x) << endl;
#define FOR(i, m, n) for(ll i = m; i < n; i++)
#define IFOR(i, m, n) for(ll i = n - 1; i >= m; i-- )
#define REP(i, n) FOR(i,0,n)
#define IREP(i, n) IFOR(i,0,n)
#define FOREACH(x,a) for(auto& (x) : (a) )
#define ALL(v) (v).begin(), (v).end()
#define SZ(x) ll(x.size())

void yes(){
  cout << ":-)" << endl;
  exit(0);
}

void no(){
  cout << ":-("<< endl;
  exit(0);
}

int main(){
  vector<ll> a(3), b(3);
  REP(i,3) cin >> a[i] >> b[i];
  ll sum = 0;
  REP(i,3) sum += a[i];
  if(sum%2==0) yes();
  else no();
}