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 -*-
"""Codeforce

Automatically generated by Colaboratory.

Original file is located at
    https://colab.research.google.com/drive/1XTEd3xULMSCXZWYeK6wKPXVsZ74tROB6
"""

year = str(int(input()) + 1)
result = True
while True:
  year_digit = ''
  for itm in year:
    if itm not in year_digit:
      year_digit += itm
    else:
      result = False
      year_digit = ''
      break
  if result:
    print(year)
    break
  else:
    result = True
    year = str(int(year) + 1)



year = str(int(input()) + 1)
year_digit = ''
result = False

for itm in year:
  if itm not in year_digit:
    year_digit += itm
  else:
    result = False
print(year_digit)

