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.
x = input()
l = []
y = int(x)+1


p = list()
l[:] = str(y)
p[:] = str(y)


def verif(s):
    m = s.copy()
    b = True
    for i in s:
        m.remove(i)
        if i in m:
            b = False
        m = s.copy()
    return b


i = 0
while 1:
    if verif(p):
        break

    for i in range(3):
        p[:] = str(y)
        if verif(p):
            break

        p.remove(p[i])
        if p.count(p[i]) >= 1:
            y += 1

        p[:] = str(y)


print(y)
