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())
while True:
    n=n+1
    x3 = n//1000
    x2 = n//100 % 10
    x1 = n//10 % 10
    x0 = n%10
    if (x0 != x1) and (x0 != x2) and (x0 != x3) and (x1 != x2) and (x1 != x3) and (x2 != x3):
        print(n)
        break