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.
y = int(input())
y = list(str(y))
i = 0
while i<=100:
    y = int(''.join(y))
    y = y + 1 
    y = list(str(y))
    x = list(set(y))
    if len(y) == len(x):
        print(int(''.join(y)))
        break 
    i = i + 1