Vanity Plates

def is_valid(s):
    # Rule 1 and 2: Length must be between 2 and 6
    if len(s) < 2 or len(s) > 6:
        return False

    # Rule 3: First two characters must be letters
    if not s[:2].isalpha():
        return False

    # Rule 4 & 5: Only letters and numbers allowed
    if not s.isalnum():
        return False

    number_found = False

    for i, char in enumerate(s):
        if char.isdigit():
            if not number_found:
                # First number found
                number_found = True
                if char == '0':
                    return False  # First number cannot be '0'
            else:
                continue  # We are still at the end

        elif number_found:
            # If a letter comes after a number, it's invalid
            return False

    return True


def main():
    plate = input("Plate: ")
    if is_valid(plate):
        print("Valid")
    else:
        print("Invalid")


if __name__ == "__main__":
    main()