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.
y=int(input())

while True:
    y += 1

    digits = set(str(y))  # why ser ? because items aren't ordered and must be unique 

    if len(digits) == 4:  # to make sure that year has 4 digits unique and 4 numbers like 2013 
        print(y)
        break