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.
import sys
def output(n):
  count = 0
  s={}
  for i in n:
    # print(i)
    # print(s.keys())
    if i in s.keys():
      # print('nigga')
      output(str(int(n)+1))
      
      
    else:
      # print(n)
      s[i] = 1
      count+=1
  if count==len(n):
    print(n)
    sys.exit(0)
n = input()
n = str(int(n)+1)
output(n)