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 True:
    year+= 1
    l=year // 1000
    m=(year // 100) % 10
    n=(year // 10) % 10
    o=year % 10
    if l!=m and l!=n and l!=o and m!=n and m!=o and n!=o:
        break
print(year)

