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.
n=int(input())
while True:
    n+=1
    n1=int(n/1000)
    n2=int((n/100)%10)
    n3=int((n/10)%10)
    n4=int(n%10)
    if n1 != n2 and n1 != n3 and n1 != n4 and n2 != n3 and n2 != n4 and n3 != n4:
        break
print(n)
