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())
for i in range(year+1, 9999):
    new_year = i
    val1 = i%10
    i //= 10
    val2 = i%10
    i //=10
    val3 = i%10
    i //= 10
    val4 =i 
    if ((val1 != val2 and val2 != val3) and (val3 != val4 and val4 != val1)) and (val2 != val4 and val1 != val3) :
        print(new_year)
        break