Reverse a String Using StackWrite a function that takes a string as input and returns the string reversed using a stack.Constraints:NAExample:Sample Input:2helloworldSample Output:hello-ollehworld-dlrow

Sure, here is a step-by-step guide on how to reverse a string using a stack in Python:

1. First, we need to understand what a stack is. A stack is a data structure that follows the Last-In-First-Out (LIFO) principle. This means that the last element added to the stack will be the first one to be removed.

2. To reverse a string using a stack, we will push all characters of the string to the stack. Then, we will pop the characters from the stack and append them to a new string. This will effectively reverse the string because of the LIFO principle of the stack.

Here is a Python function that implements this:

def reverse_string(input_string):
    # Create an empty stack
    stack = []

    # Push all characters of the string to the stack
    for char in input_string:
        stack.append(char)

    # Pop the characters from the stack and append them to a new string
    reversed_string = ''
    while stack:
        reversed_string += stack.pop()

    return reversed_string

You can use this function to reverse a string as follows:

print(reverse_string('helloworld'))  # Output: 'dlrowolleh'

This function works by iterating over the input string and pushing each character to the stack. Then, it creates a new string by popping each character from the stack and appending it to the new string. Since a stack follows the LIFO principle, the characters are popped in reverse order, effectively reversing the string.