def verify(message, expected, actual):
    a = "========================="
    print(a)
    print(message)
    if type(actual) != type(expected) or actual != expected:
        print("FAILED!")

        print(f"Expected value: {expected}")
        print(f"Actual value: {actual}")

        print(a)
        return False
    else:
        print("SUCCESS!")
        print(a)
        return True


def verify_all(dataset):
    summa_success = int()
    summa_failed = int()
    for result in dataset:
        if verify(result[0], result[1], result[2]):
            summa_success += 1
        else:
            summa_failed += 1
    print("Total:", len(dataset), "Successful:", summa_success, "Failed:", summa_failed)
    return True


def first_recurring_char(s):
    array = []
    p = 1
    t = 0
    k = str
    if type(s) is str and s is not None:
        for i in s:
            if i.isalpha():
                array.append(i)
                k = i
                t += 1
                for j in array[0:t-1]:
                    if k == j:
                        p += 1
                        if p > 1:
                            return k
                        break
    else:
        return None



dataset = [  # Проверочные тесты, что вообще что-то работает
    ("first_recurring_char0", None, first_recurring_char([1])),
    ("first_recurring_char1", ("п"), first_recurring_char("у попа была собака")),
    ("first_recurring_char2", None, first_recurring_char("япчм")),
    ("first_recurring_char3", None, first_recurring_char(-2)),
    ("first_recurring_char4", ("q"), first_recurring_char("qwertyuiopq")),

    # Тесты на пустые значения
    ("first_recurring_char5", None, first_recurring_char('')),
    ("first_recurring_char6", None, first_recurring_char(None)),

    # Тесты на неверный тип
    ("first_recurring_char7", None, first_recurring_char(True)),
    ("first_recurring_char8", None, first_recurring_char({1212})),

    # Тесты на редкие случаи
    ("first_recurring_char9", ("а"), first_recurring_char("у Попа была собака, он ее прибил")),
    ("first_recurring_char10", ("W"), first_recurring_char(("WWW"))),
    ("first_recurring_char11", ("Г"), first_recurring_char('гГваунзГг')),
]


verify_all(dataset)