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.
s = input()
m = int(s) + 1
k = 0
b = True
while b:
    t = str(m)
    n = ''
    for i in t:
        if i not in n:
            n += i
        else:
            continue
    if len(n) == 4:
        k = int(n)
        b = False
    elif len(n) < 4:
        m += 1
        continue
print(k)
