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def alternative_string_arrange(first_str: str, second_str: str) -> str:

"""

Return the alternative arrangements of the two strings.

:param first_str:

:param second_str:

:return: String

>>> alternative_string_arrange("ABCD", "XY")

'AXBYCD'

>>> alternative_string_arrange("XY", "ABCD")

'XAYBCD'

>>> alternative_string_arrange("AB", "XYZ")

'AXBYZ'

>>> alternative_string_arrange("ABC", "")

'ABC'

"""

first_str_length: int = len(first_str)

second_str_length: int = len(second_str)

abs_length: int = (

first_str_length if first_str_length > second_str_length else second_str_length

)

output_list: list = []

for char_count in range(abs_length):

if char_count < first_str_length:

output_list.append(first_str[char_count])

if char_count < second_str_length:

output_list.append(second_str[char_count])

return "".join(output_list)

if __name__ == "__main__":

print(alternative_string_arrange("AB", "XYZ"), end=" ")