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.
n=int(input())
ans=0
a=[]
while ans==0:
    n+=1
    nn=n
    for i in range(0,4)[::-1]:
        a.append(nn//10**i)
        nn=nn%10**i
    a=list(set(a))
    if len(a)>=4:
        ans=n
    else: a=[]
print(ans)