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())
cnt=0
y+=1
sp=[]
while cnt==0:
    n=y
    while n>0:
        if n%10 not in sp:
            sp.append(n%10)
        else:
            sp=[]
            break
        n//=10
        if n==0:
            cnt+=1
            year=y
    y+=1
print(year)