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.
testcases = input()
n1 = int(testcases)
n2 = set(testcases)
if len(n2)<4:
    while len(n2)<4:
        n1+=1
        res = str(n1)
        ans = set(res)
        if len(ans)==4:
            n2.clear()
            n2.update(ans)
    print(n1)
elif len(n2)==4:
    while len(n2)==4:
        n1+=1
        res = str(n1)
        ans = set(res)
        if len(ans)==4:
            n2.update(ans)
    print(n1)
