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#!/opt/local/bin/python
#
# See ../README.md
#
#
# Run as: python ch-2.py < input-file
#
import fileinput
outputs = []
#
# Read input, split on commas, build output strings.
#
for line in fileinput . input ():
fields = line . rstrip () . split (",")
if (len (outputs)):
for i in range (len (fields)):
outputs [i] = outputs [i] + "," + fields [i]
else:
outputs . extend (fields)
#
# Print output lines
#
for line in outputs:
print (line)
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