# Write a Python Dictionary to find mirror characters in a string 
# function to mirror characters of a string


def mirrorChars(input,k):


    # create dictionary
    original = 'abcdefghijklmnopqrstuvwxyz'
    reverse = 'zyxwvutsrqponmlkjihgfedcba'
    dictChars = dict(zip(original,reverse))


    # separate out string after length k to change
    # characters in mirror
    prefix = input[0:k-1]
    suffix = input[k-1:]
    mirror = ''


    # change into mirror
    for i in range(0,len(suffix)):
         mirror = mirror + dictChars[suffix[i]]


    # concat prefix and mirrored part
    print (prefix+mirror)
          
# Driver program
if __name__ == "__main__":
    input = 'paradox'
    k = 3
    mirrorChars(input,k)