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.
y = int(input))
y = y+1
while(True):
  yy = y
  a = y%10
  y = int(y/10)
  b = y%10
  y = int(y/10)
  c = y%10
  y = int(y/10)
  d = y%10
  if(a!=b and a!=c and a!=d and b!=c and b!=d and c!=d):
    print(yy)
    break
  else:
    y = yy+1