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.
t = int(input())
t += 1
while True:
    t = str(t)
    if t[0] != t[1] and t[0] != t[2] and t[0] != t[3] and t[1] != t[2] and t[1] != t[3] and t[2] != t[3]:
        t = int(t)
        print(t)
        break
    else:
        t = int(t)
        t += 1
