Adding together nicknames - mixed results may output...

namesum.py

import string

a = "fouric"
b = "nocyno"
name_sum = ""
name_difference_ab = ""
name_difference_ba = ""
alphabet = string.ascii_lowercase

for index in range(len(a)):
    # Make sure to add one to convert to one-indexing.
    a_index = alphabet.index(a[index]) + 1
    b_index = alphabet.index(b[index]) + 1
    # Then, subtract one to go back into zero-indexing.
    sum_index = a_index + b_index - 1
    difference_ab_index = a_index - b_index - 1
    difference_ba_index = b_index - a_index - 1
    # Use moduluo 26 to keep within alphabet
    name_sum += alphabet[sum_index % 26]
    name_difference_ab += alphabet[difference_ab_index % 26]
    name_difference_ba += alphabet[difference_ba_index % 26]
    
print name_sum
print name_difference_ab
print name_difference_ba