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())
m=n+1

while m<=9000:
    a=str(m)
    l=[]
    for i in a:
        if i not in l:
            l.append(i)
    if len(l)==4:
        break
    m+=1
print(m)