#include <bits/stdc++.h>
using namespace std;
#define modulo 1000000007
#define mod(mod_x) ((((long long)mod_x+modulo))%modulo)
#define Inf 10000000000000000



int main(){
	
	long long sum = 0;
	for(int i=0;i<3;i++){
		long long A,B;
		cin>>A>>B;
		sum+=A;
	}
	
	if(sum%2==0){
		cout<<":-)"<<endl;
	}
	else{
		cout<<":-("<<endl;
	}
	
	return 0;
}