start = "allo"
end = "bwar"
trans = start
char = list("abcdefghijklmnopqrstuvwxyz")
print start
finish = 0
while not finish:
StrList = [""]*len(start)
for i in range(len(start)):
if trans[i] != end[i]:
li = char.index(trans[i]) + 1
if li == len(char): li = 0
StrList[i] = char[li]
else:
StrList[i] = trans[i]
trans = ""
for c in StrList: trans += c
if trans == end: finish = 1
print trans