#include <iostream>
 
 using namespace std;
 
 char znak;
 int i=0;
 int stos[10];
 
 int main()
 {
 while (cin>>znak)
         {
             if (znak == '+')
                 {
                     cin>>stos[i];
                     if (i<=9)
                         {
                             cout<<":)"<<endl;
                             i++;
                         }
                     else cout<<":("<<endl;
                 }
             else if (znak == '-')
             {
                     if (i>0)
                         {
                             i--;
                             cout<<stos[i]<<endl;
                         }
                     else cout<<":("<<endl;
             }
         }
 
     return 0;
 }

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+
1
+
2
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3
+
4
+
5
+
6
+
7
+
8
+
9
+
0
+
1
-
-
-
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-
-
-
-
-
-
-