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import re
 
try:
  while True:
    x = input()
    print(re.sub(r"(.)(?=(...)+$)", "\\1,", x))
except (EOFError):
  pass

Success #stdin #stdout 0.04s 9672KB

stdin

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1
12
123
1234
12345
123456
1234567
12345678
123456789
1234567890
12345678901
123456789012

stdout

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1
12
123
1,234
12,345
123,456
1,234,567
12,345,678
123,456,789
1,234,567,890
12,345,678,901
123,456,789,012

https://ideone.com/MnX4LE

language:

Python 3 (python 3.12)

created:

visibility:

public

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