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.
x=input()
i=int(x)
while(1):
    i=i+1
    l=str(i)
    l=list(l)
    k=[]
    for m in l:
        if m not in k:
            k.append(m)

    if(len(k)==len(l)):
        s="".join(k)
        break

print(s)