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 = input()
while True:
    number = int(number) + 1
    number = str(number)
    if number[0] != number[1] and number[0] != number[2] and number[0] != number[3] and number[1] != number[2] and number[1] != number[3] and number[2] != number[3]:
        break
print(number)