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 Sun Sep 17 19:20:04 2023

@author: He'Bing'Ru
"""

y_ = int(input())+1
y = list(str(y_))
while (y[0]==y[1])+(y[0]==y[2])+(y[0]==y[3])+(y[1]==y[2])+(y[1]==y[3])+(y[2]==y[3]) :
    y_ += 1
    y = list(str(y_))
print(y_)