using System;

//==========================================================
// Stack< T >
//==========================================================
class Stack< T > {
  protected T[] data;
  protected int top;
  
  // creates stack of the specified size
  public Stack(int size) {
    data = new T[size];
    top = -1;
  }
  
  // pushes the value x on the stack
  public void Push(T x) {
    if (top == data.Length - 1) throw new Exception("-- stack overflow");
    data[++top] = x;
  }
  
  // pops the topmost value from the stack
  public T Pop() {
    if (top < 0) throw new Exception("-- stack underflow");
    return data[top--];
  }
  
  // returns the stack size
  public int Size {
    get { return top + 1; }
  }
}

//----------------------------------------------------------
// test program; to be called with a list of argument words
//----------------------------------------------------------
class Test {
  
  public static void Main(string[] args) {
    //--- use two stacks to store the command line arguments
    //--- and their lengths
    Stack<string> stringStack = new Stack<string>(10);
    Stack<int> intStack = new Stack<int>(10);
    foreach (string s in args) {
      stringStack.Push(s);
      intStack.Push(s.Length);
    }
    while (stringStack.Size > 0)
      Console.WriteLine(stringStack.Pop() + ": " + intStack.Pop());
  }
}