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())
distinct = False

while distinct == False:
    n = n+1
    y = str(n)
    if y[3] != y[2] and y[3] != y[1] and y[3] != y[0]:
        if y[2] != y[1] and y[2] != y[0]:
            if y[1] != y[0]:
                distinct = True

print(n)