using System;
using System.Collections;
class StackDemo {
public static void Main() {
Stack st = new Stack();
st.Push(1);
st.Push(2);
foreach(int i in st)
Console.Write(i + " ");
st.Push(1);
Console.Write("stack: ");
foreach(int i in st)
Console.Write(i + " ");
Console.WriteLine();
Console.Write("Pop -> ");
int a = (int) st.Pop();
Console.WriteLine(a);
Console.Write("stack: ");
foreach(int i in st)
Console.Write(i + " ");
Console.WriteLine();
}
}
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