def transpose_two_strings(arr):
    first = arr[0]
    second = arr[1]
    final_string = ''

    for i in range(max(len(first), len(second))):
        try:
            final_string += first[i]
        except:
            final_string += ' '

        final_string += ' '

        try:
            final_string += f'{second[i]}\n'
        except:
            final_string += ' \n'

    return final_string[:-1]