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 Sep 12 16:08:24 2023

@author: Zinc
"""
n=int(input())
for i in range(n+1,9001): 
    s={str(x) for x in str(i)}
    if len(s)==4:
        print(i)
        break
    else: 
        s.clear()
        continue