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.
y = input()
y = int(y) + 1
r = list(str(y))
# print(r)
f = 0
while not f:
    count = 0
    for i in r:
        count += r.count(i)
    if count > 4:
        y = int(y) + 1
        r = list(str(y))
        # print(r.count(i))
    else:
        f = 1

for i in r:
    print(i, end='')
