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.
year=int(input())
while year <=9000 and year>=1000:
    flag=True
    check=[]
    for char in str(year):
        if char in check:
            flag=False
            break
        check.append(char)
    if flag:
        print(year)
        break
    else:
        year+=1