#include<iostream>
using namespace std;
int rozmiar;
int dane[10];
char a;
int main()
{
do
{
cin>>a;
switch(a)
{
case'+':
{
cin>>dane[rozmiar];
if(rozmiar<=9)
{
cout<<":)"<<endl;
rozmiar++;}
else cout<<":("<<endl;
break;
}
//--------------------------------------------------------------------------------------------------------------------------------
case '-':
{ if(rozmiar>=0){
rozmiar--;
cout<<dane[rozmiar]<<endl;}
else cout<<":("<<endl;
break;
}
//--------------------------------------------------------------------------------------------------------------------------------
}
}while(a=20);
return 0;
}
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