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())


n += 1
val = list(str(n))
v = set(val)
while len(val) != len(v):
    n += 1
    val = list(str(n))
    v = set(val)
    
print(n)