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()) + 1

a = n // 1000
b = n // 100 % 10
c = n // 10 % 10
d = n % 10

while a == b or a == c or a == d or b == c or b == d or c == d:
    n += 1
    a = n // 1000
    b = n // 100 % 10
    c = n // 10 % 10
    d = n % 10
print(n)


