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=input()#y-given year
k=int(y)+1
while True:
    a=str(k)
    l=[]
    m=set()
    for i in a:
        m.add(i)
        l.append(i)
    if(len(m)==len(l)):
        print(k)
        break
    else:
        k+=1