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.
num = int(input())
while(1):
    num+=1
    s = str(num)
    s = list(s)
    k = len(set(s))
    if k==4:
        print(num)
        break
    else:
        continue
    