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.

y= int(input())

while(True):
    y += 1
    a=int(y/1000)
    b=int(y/100%10)
    c=int(y/10%10)
    d=int(y%10)

    if( a!=b and a!=c and a!=d and b!=c and b!=d and c!=d):
        break


print(y)


