using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
class Stos
{
    public int[] tablica = new int[10];
    int s_top=0;
 
 
    public void push()
    {
        if (s_top == 10)
            Console.WriteLine(":(");
        else
        {
 
            tablica[s_top] = int.Parse(Console.ReadLine());
            s_top ++;
            Console.WriteLine(":)");
        }
    }
    public void pop()
    {
        if (s_top == 0)
            Console.WriteLine(":(");
        else
        {
            Console.WriteLine(tablica[s_top-1]);
            s_top --;
        }
 
    }
}
 
 
 
    class Program
    {
 
        static void Main(string[] args)
        {
        Stos stos_1 = new Stos();
        while (true)
        {
 
 
            string a = Console.ReadLine();
            if (a[0] == '+')
                stos_1.push();
            else if(a[0]=='-')
                stos_1.pop();
 
        }
 
    }
 
}
 
 
 
 

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