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 14:15:26 2023

@author: 15110
"""

def judge(x):
    data=[]
    for i in x:
        if i not in data:
            data.append(i)
    if len(data)==4:
        return False
    else:
        return True

re=True
y=input()
while re:
    y=str(int(y)+1)
    re=judge(y)
print(y)
