How can i break out of a loop within a loop? Python

Question

word = input('Please write a word:')
length_word = len(word)
index = length_word - 1
x = 1
restart_variable = 1
while x != 0:
    try:
        while index >= 0:
            letter = word[index]
            print(letter)
            index = index - 1
    except:
        print('Please enter a word')
    while restart_variable != 0:
        end_program = input('Would you like to restart the program? (Y/N) ')
        if end_program == 'Y' or end_program == 'y':
            break
        elif end_program == 'N' or end_program == 'n':
            x = 0
            restart_variable = 0
            break
        elif end_program != ('Y'or'N') or end_program != ('y' or 'n'):
            print('Please enter specified commands.')
            continue
print('Goodbye!')
input('Press enter to exit the terminal')

Hi!

I have tried to build this word reverser program, but when i press y/Y (which should make the program restart) and try to restart the program i am brought back to the "while restart_variable" loop.

This input however should make the program restart. What am i missing?

Thanks to everyone who will answer!