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.
a = int(input())
a += 1
done = False
def is_distinct(num):
   for i in str(num):
      if str(num).count(i) > 1:
         return False
   return True
while done == False:
   if is_distinct(a) == True:
      print(a)
      done = True
   else:
      a += 1
