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())
b = a+1
c = list(str(b))
d = set(str(b))
s = True
while s:
    if len(c) > len(d):
        b += 1
    else:
        s = False
print(b)