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())
for i in range(a+1,9000):
   b=i//10
   a1=i%10
   c=b//10
   b1=b%10
   d=c//10
   c1=c%10
   if(a1!=b1 and a1!=c1 and a1!=d and b1!=c1 and b1!=d and c1!=d):
      print(i)
      break