# Kontrola vstupu
def wrong_input(inpt):
    # Pomocna promenna
    result = False

    # Je vstup 4 mistne cele cilo?
    if not inpt.isdecimal() or len(inpt) != 4:
        print('Please enter a whole 4-digit number')
        result = True

    # Ma cislo unikatni cislice?
    if len(set(inpt)) != 4:
        print('Please enter a number not repeating the digits')
        result = True

    # Vraceni testovani
    return result