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=input()
a=[]
n=int(n)+1
n=str(n)
for i in n:
    a.append(n.count(i))
s=0
while s==4:
    if 1 in a:
        s+=1
    if s<4:
        n=int(n)+1
        n=str(n)
print(n)