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.
s = int(input())
s+=1
while(True):
    t = [x for x in str(s)]
    f = set(t)
    if len(t) != len(f):
        s+=1
    else:
        break
print(s)

