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.
number=int(input())
while True:
    number+=1
    a=str(number)
    flag=1
    for i in range(len(a)):
        for j in range(i+1,len(a)):
            if(a[i]==a[j]):
                flag=0
    if(flag==1):
        print(number)
        exit()
    