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 Tue Oct 10 15:03:24 2023

@author: 刘婉婷 2300012258
"""

y=int(input())
while True:
    y+=1
    k=str(y)
    for i in k:
        if k.count(i)!=1:
            break
    else:
        print(y)
        break