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.
user = int(input())
found = False
for i in range(user + 1,9001,1):
    if found == False:
        a_string = ""
        for j in str(i):
            if j not in a_string:
                a_string += j
                found = True
            else:
                found = False
                break
    else:
        break
print(a_string)