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.
y = int(input())
s = set()
for i in range (y+1, y+100):
    t = i
    s.clear()
    while(t>0):
        r = t%10
        if r in s:
            break
        else:
            s.add(r)
        t=t//10
    if(t==0):
        print(i)
        break