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 Aug 29 21:10:56 2023

@author: Lenovo
"""
def j(n):
    l = [c for c in str(n)]
    l_s = set(l)
    if len(l) == len(l_s):
        return 1
    return 0

n = int(input())
while n:
    n += 1
    if j(n):
        break

print(n)