#include <bits/stdc++.h>
using namespace std;

#define REP(i, n) for(int (i) = 0; (i) < (n); (i)++)
#define MAX(a, b) ((a) > (b) ? (a) : (b))
#define MIN(a, b) ((a) < (b) ? (a) : (b))

typedef long long ll;

int main(void){
	int a, b, odd = 0;
	REP(i, 3){
		cin >> a >> b;
		if(a%2) odd++;
	}

	if(odd%2) cout << ":-(" << endl;
	else cout << ":-)" << endl;

	return 0;
}