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())
m = n
while True:
    m = str(int(m)+1)
    if m.count(m[0]) == 1 and m.count(m[1]) == 1 and m.count(m[2]) == 1 and m.count(m[3]) == 1:
        print(m)
        quit(0)
    