#include <iostream>
using namespace std;
 
int stos [10];
int rozmiar;
 
void push ()
{
    if (rozmiar>=10)
    {
        cout <<endl<< ":("<<endl;
    }
    else
    {
        cin >> stos[rozmiar];
        cout <<endl<< ":)"<<endl;
        rozmiar = rozmiar +1;
 
    }
 
}
void pop ()
{
    if (rozmiar>=1)
    {
        rozmiar = rozmiar - 1;
 
        cout << stos[rozmiar];
 
    }
    else {
        cout <<endl<<":("<<endl;
    }
}
 
 
 
 
int main()
{
    rozmiar = 0;
    char wybor;
    while (cin >>wybor)
   {
       switch (wybor) {
           case '+':
               push();
               break;
               case '-':
               pop();
               break;
 
       }
   }
 
 
 
 
 
 
 
 
 
 
    return 0;
}

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0
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