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.
x = int(input())
while true :
    x += 1
    if (x[0]!=x[1]) and (x[0]!=x[2]) and (x[0]!=x[3]) and (x[1]!=x[2]) and (x[1]!=x[3]) and (x[3]!=x[2]):
        print (x)
        break