#include <iostream>
 
using namespace std;
 
char znak;
int liczby[10];
 
int main()
{
    int ilosc_liczb=0;
    while (cin>>znak)
    {
        if (znak=='-')
        {
            ilosc_liczb--;
            cout<<"ilosc-:"<<ilosc_liczb<<endl;
            if (ilosc_liczb<0)
            {
                cout<<":("<<endl;
                ilosc_liczb++;
            }
 
            else
            {
                cout<<liczby[ilosc_liczb+1]<<endl;
 
            }
        }
        if (znak=='+')
        {
            ilosc_liczb++;
            cout<<"ilosc+:"<<ilosc_liczb<<endl;
            cin>>liczby[ilosc_liczb-1];
            if (ilosc_liczb>10)
            {
                cout<<":("<<endl;
                ilosc_liczb--;
            }
 
            else cout<<":)"<<endl;
        }
 
    }
 
    return 0;
}
 

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