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.
c=int(input())
a=(c+1)%10
b=((c+1)//10)%10
e=(((c+1)//10)//10)%10
r=((((c+1)//10)//10)//10)%10
set=set()
set.add(a)
set.add(b)
set.add(e)
set.add(r)
while len(set)!=4:
    c+=1
if len(set)==4:
    print(c)