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())
next_year = 0
while True:
    y = y+1
    a1 = y // 1000
    a2 = (y % 1000) // 100
    a3 = (y % 100) // 10
    a4 = y % 10
    if len(set([a1, a2, a3, a4])) == 4:
        print(y)
        break