def student_code_check():
    s_code = input("Sisesta oma 6-kohaline tudengi kood: ")
    if (not s_code.isnumeric() or
            len(s_code) !=6):
        print(f"Tudengi kood koosneb 6 numbrist")
        print(f"N??ide: 123456IACB")
        print(f"       |    |")
        print(f"       123456")
        return False
    print(f"{s_code}", end = "")
    return s_code

def calc_frac_numbers(number):
    s_code_a = ((int(number) % 10000) + 2.3) * 9 / 41
    s_code_b = ((int(number) % 10000) + 4.7) * 11 / 39
    print(f" -> a: {(s_code_a % 10): 3.2f}", end = "")
    print(f" | b: {(s_code_b  % 10): 3.2f}")


def main():
    while True:
    	s_code = student_code_check()
    	if s_code != False:
     		break

    calc_frac_numbers(s_code)


if __name__ == "__main__":
    main()