It seems like the year of 2013 came only yesterday. Do you know a curious fact? The year of 2013 is the first year after the old 1987 with only distinct digits.

Now you are suggested to solve the following problem: given a year number, find the minimum year number which is strictly larger than the given one and has only distinct digits.
The single line contains integer *y* (1000 ≤ *y* ≤ 9000) — the year number.
number = int(input())

flag = 0
while flag != 1:
    number = number + 1
    digits = []


    number_str = str(number)

    for digit_char in number_str:
        digit = int(digit_char)
        digits.append(digit)
    flag2 = 1
    n = len(digits)
    for i in range(n):
        for j in range(i+1,n):
            if digits[i] == digits[j]:
                flag2 = 0


    if flag2 == 1:
        print(number)
        break
