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.
a=int(input())

while True:
    a += 1
    b =list(str(a))
    c=str(a).count(b[0])
    o=str(a).count(b[1])
    u=str(a).count(b[2])
    n=str(a).count(b[3])
    if(c+o+u+n==4):
        break

print(a)
