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.
from collections import defaultdict, deque
from sys import stdin

input = stdin.readline

def get():
    return [int(i) for i in input().split()]
 

num = int(input())
for i in range(num + 1, 50000):
    s = str(i)
    if len(set(s)) == len(s):
        print(s)
        break

    



    