import sys

def push(element, size, stack):

'''

this function is used to push the elements

in the stack and it will return Error! message

if the stack is full and terminate the program.

'''

global top

if top >= size - 1:

print('Stack Overflow')

sys.exit()

else:

top += 1

stack[top] = element

def pop():

'''

this function is used to pop elements from

the stack and it will return Error! message

if the stack is empty and terminate the program.

'''

global top

if top < 0:

print('Stack Underflow')

sys.exit()

else:

element = stack[top]

print('%s' % element, end='')

top -= 1

def reverse_by_sort(string):

'''

This function is used to reverse any string

by reversed() method.

'''

string = list(string)

rev_str = ''

for i in reversed(string):

rev_str += i

return rev_str

if __name__=='__main__':

size = 11

stack = [0]*size

string = 'Includehelp'

top = -1

# Pushing value in the stack

push('I', 11, stack)

push('n', 11, stack)

push('c', 11, stack)

push('l', 11, stack)

push('u', 11, stack)

push('d', 11, stack)

push('e', 11, stack)

push('h', 11, stack)

push('e', 11, stack)

push('l', 11, stack)

push('p', 11, stack)

print('Original String = %s' % string)

print('\nUsing Stack')

# Popping values from stack and printing them

print('Reversed String = ',end='')

for i in stack:

pop()

print('\n\nUsing sort()')

print('Reversed string = %s' % reverse_by_sort(string))