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.
m = int(input())
n = k = m
while True:
    k += 1
    n = k
    y1 = n % 10
    n //= 10
    y2 = n % 10
    n //= 10
    y3 = n % 10
    n //= 10
    y4 = n % 10
    if (y1 == y2 or y1 == y3 or y1 == y4 or y2 == y3 or y2 == y4 or y3 == y4):
        continue
    else:
        print(k)
        break