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())
if year<2013:
    print(2013)
else:
    while(1):
        year += 1
        s = str(year)
        if s[0]!=s[1] and s[0]!=s[2] and s[0]!=s[3] and s[1]!=s[2] and s[1]!=s[3] and s[2]!=s[3]:
            print(s)
            break
        else:
            continue