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.
year = int(input())

distinct = True
while distinct:
    year += 1
    str_year = str(year)
    
    for i in range(len(str_year)):
        for j in range(i + 1, len(str_year)):
            if str_year[i] == str_year[j]:
                distinct = False

print(year)