# num2alpha.py vs infiniteshakespearianmonkey

# num2alpha.py -- demo vs infiniteshakespearianmonkey ;)
subatomic = 'abcdefghijklmnopqrstuvwxyz_' # "_" represents other key elements

def num2alpha(num):
    letters = ''
    while num:
        mod = (num - 1) % 27 #26
        letters += subatomic[mod] # or... chr(mod + 65).lower()
        num = (num - 1) // 27 #26
    return ''.join(reversed(letters))
#

result = ''
count = 1
while result != 'bye' and len(result) < 19: # or True (as pseudo infinite)
    result = num2alpha(count)
    print result,
    count += 1