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())
arr=[]
while True:
    n=n+1
    k=str(n)
    for num in k:
        arr.append(num)
    if arr[0]!=arr[1]and arr[1]!=arr[2] and arr[2]!=arr[3] and arr[3]!=arr[0]and  arr[1]!=arr[3] and arr[0]!=arr[2]:
        print(n)
        break
    else:
        arr.clear()