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#!/opt/local/bin/python
#
# See ../README.md
#
#
# Run as: python ch-1.py < input-file
#
import fileinput
def make_sequence (string, start):
if string == start:
return [start]
if 0 == string . find (start):
tail = string [len (start) :]
result = make_sequence (tail, str (int (start) + 1)) or \
make_sequence (tail, str (int (start) - 1))
if result:
return [start] + result
return None
for line in fileinput . input ():
line = line . strip ()
for i in range (0, len (line)):
result = make_sequence (line, line [0 : i + 1])
if result:
print ("," . join (result))
break
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