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license_number.py

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def license_number(key, K):

res, alnum = [], []

for char in key:

if char != "-":

alnum.append(char)

for i, char in enumerate(reversed(alnum)):

res.append(char)

if (i+1) % K == 0 and i != len(alnum)-1:

res.append("-")

return "".join(res[::-1])

print(license_number("a-bc-dfd-df", 1), 1)

print(license_number("a-bc-dfd-df", 2), 2)

print(license_number("a-bc-dfd-df", 3), 3)

print(license_number("a-bc-dfd-df", 4), 4)

print(license_number("a-bc-dfd-df", 5), 5)