def afm_atoms_creator(in_data: list, custom_atom='Po') -> list:
    """
    Args:
        in_data (list) - list of rows from POSCAR type file.

    Add one type of "Fake" atom into the POSCAR structure.
    This allows it to be treated as an atoms with spin up and down respectively,
    thus estimate number of positive and negative contributions into the total energy.
    """
    out_data = in_data.copy()
    out_data[6] = 'direct\n'
    stech_str = in_data[0].split(' str #:')[0]
    right_atom_type = f'{custom_atom} ' + ''.join([i for i in stech_str if not i.isnumeric()])
    out_data[5] = right_atom_type + '\n' + in_data[5]
    return out_data