def to_title_case(word: str) -> str:
 """
 Converts a string to capitalized case, preserving the input as is

 >>> to_title_case("Aakash")
 'Aakash'

 >>> to_title_case("aakash")
 'Aakash'

 >>> to_title_case("AAKASH")
 'Aakash'

 >>> to_title_case("aAkAsH")
 'Aakash'
 """

 """
 Convert the first character to uppercase if it's lowercase
 """
 if "a" <= word[0] <= "z":
 word = chr(ord(word[0]) - 32) + word[1:]

 """
 Convert the remaining characters to lowercase if they are uppercase
 """
 for i in range(1, len(word)):
 if "A" <= word[i] <= "Z":
 word = word[:i] + chr(ord(word[i]) + 32) + word[i + 1 :]

 return word


def sentence_to_title_case(input_str: str) -> str:
 """
 Converts a string to title case, preserving the input as is

 >>> sentence_to_title_case("Aakash Giri")
 'Aakash Giri'

 >>> sentence_to_title_case("aakash giri")
 'Aakash Giri'

 >>> sentence_to_title_case("AAKASH GIRI")
 'Aakash Giri'

 >>> sentence_to_title_case("aAkAsH gIrI")
 'Aakash Giri'
 """

 return " ".join(to_title_case(word) for word in input_str.split())


if __name__ == "__main__":
 from doctest import testmod

 testmod()