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