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.
'''
Author       : InHng
LastEditTime : 2023-11-10 16:22:41
'''
def f(x):
    return len(set(str(x)))


n = int(input()) + 1
while f(n) < 4:
    n += 1
print(n)
