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.
# -*- coding: utf-8 -*-
"""
Created on Wed Sep 13 17:09:50 2023

@author: gzk16
"""

year = int(input())
beautiful_year = year
while True:
    beautiful_year += 1
    jihe = {x for x in str(beautiful_year)}
    if len(jihe) == len(str(beautiful_year)):
        print(beautiful_year)
        break
    else:
        continue