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.

year = int(input())
year+=1
while year<9001:
    s=str(year)
    sDigits='0123456789'
    for i in sDigits:
        if s.count(i)>1:
            year+=1
            break
    else:
        break
print(year)





