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=input()
c=0
y=int(y)
while c==0:
    y+=1
    y=str(y)
    y1=list(y)
    y2=set(y)
    if len(y1)==len(y2):
        c==1
        break
    y=int(y)
print(y)   