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Here is a simple approach using the built-in Python .isdigit(), .isalpha() and .zfill() methods. This approach uses the Python parser.

Pre-logic code block

def changeAddress(y):
  integer = ''.join(x for x in y if x.isdigit())
  string = ''.join(x for x in y if x.isalpha())
  final = integer.zfill(3)
  return final + string

changeAddress(!YourField!)