# File: ChapterStrings/movingx.py
""" Moving X. Write a program that, given a single line input of a single string of 1 − 100 characters
(with no white space between them), prints the string with an 'X' character inserted at 
the earliest position, another string with an 'X' inserted at the second earliest position, 
and so forth until the original string with an 'X' postfixed is printed.
Input: Enter a string? abcd
Output:	Xabcd
	aXbcd
	abXcd
	abcXd
	abcdX
"""

def main():
    s = input('Enter a string? ')
    m = len(s)                      # find its length
    k = 0                           # start find first position k=0
    while k <= m :
        print(s[:k] + 'X' + s[k:])  #insert X in position k
        k = k + 1
main()