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.
n=int(input())
year=str(n)

while True:
    n+=1
    year=str(n)
    if year[0]!=year[1] and year[1]!=year[2] and year[3]!=year[2] and year[1]!=year[3] and year[0]!=year[3] and year[2]!=year[0]:
        print(n)
        break