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 = int(input())

not_found = True
while not_found:
    digits = set()
    y += 1
    for x in str(y):
        digits.add(x)
    if len(digits) == 4:
        not_found = False

print(y)