def start(st_reg_number):
    """Checks the number valiaty for the Parana state"""
    divisor = 11
    weights_first = [3, 2, 7, 6, 5, 4, 3, 2]
    weights_secund = [4, 3, 2, 7, 6, 5, 4, 3, 2]
    if len(st_reg_number) > 10:
        return False
    if len(st_reg_number) < 10:
        return False
    sum_total = 0
    for i in range(len(st_reg_number) - 2):
        sum_total = sum_total + int(st_reg_number[i]) * weights_first[i]
        rest_division = sum_total % divisor
    digit_first = divisor - rest_division
    if digit_first == 10 or digit_first == 11:
        digit_first = 0
    num = 0
    mult = 100000000
    for i in range(len(st_reg_number) - 2):
        num = num + int(st_reg_number[i]) * mult
        mult = mult // 10
    num = num + digit_first
    if num < 10000000:
        new_st = str('0') + str(num)
    else:
        new_st = str(num)
    sum_total = 0
    for i in range(len(new_st)):
        sum_total = sum_total + int(new_st[i]) * weights_secund[i]
    rest_division = sum_total % divisor
    digit_secund = divisor - rest_division
    if digit_secund == 10 or digit_secund == 11:
        digit_secund = 0
    digit_first_check = digit_first == int(st_reg_number[len(st_reg_number) -
        2])
    if digit_secund == int(st_reg_number[len(st_reg_number) - 1]
        ) and digit_first_check:
        return True
    else:
        return False
