def lenRecur(aStr):
if aStr:
return 1 + lenRecur(aStr[1:])
else:
return 0
print(lenRecur("Hello"))
ZGVmIGxlblJlY3VyKGFTdHIpOgogICAgaWYgYVN0cjoKICAgICAgICByZXR1cm4gMSArIGxlblJlY3VyKGFTdHJbMTpdKQogICAgZWxzZToKICAgICAgICByZXR1cm4gMAogICAgICAgIApwcmludChsZW5SZWN1cigiSGVsbG8iKSkKICAgICAgICAKICAgICAgICAK