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 = input()
flag = True
while flag:
    a = int(a)
    a += 1
    a = str(a)
    if a.count(a[0]) == 1 and a.count(a[1]) == 1 and a.count(a[2]) == 1 and a.count(a[-1]) == 1:
        flag = False
print(a)