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.
nu=int(input())+1
while(nu>0):
    bol=True
    num=str(nu)
    li=[]
    li=list(num)
    st=set(li)
    if(len(st)==4):
        print(nu)
        break
    else:
        nu+=1