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 += 1
    d = n // 1000  
    a = n % 10
    b = (n %100)//10
    c = (n // 100) - d*10
    if (a!=b) and (a!=c) and (a!=d) and (b!=c) and (b!=d) and (c!=d):
        print(n)
        break