import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Stack;
import java.util.StringTokenizer;
class Main {
public static class Doll {
int size, emptySpace;
public Doll(int s) {
this.size=s;
this.emptySpace=s;
}
}
public static void main (String [] args) throws Exception {
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
String s;
while ((s=br.readLine())!=null) {
StringTokenizer st=new StringTokenizer(s);
Stack<Doll> stk=new Stack<>();
int dollCount=0;
while (st.hasMoreTokens()) {
int n=Integer.parseInt(st.nextToken());
dollCount++;
if (n<0) {
Doll d=new Doll(-n);
if (stk.empty()) stk.add(d);
else if (stk.peek().emptySpace>d.size) {
stk.peek().emptySpace-=d.size;
stk.add(d);
} else break;
} else {
if (!stk.isEmpty() && stk.peek().size==n) stk.pop();
else break;
}
}
if (stk.size()==0 && dollCount%2==0) System.out.println(":-) Matrioshka!");
else System.out.println(":-( Try again.");
}
}
}
