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.
n = int(input())
i = 0;

def distinct(a):
    arr = []
    for b in a:
        if b not in arr:
            arr.append(b)
    return True if (len(a) == len(arr)) else False

while(i != 1):
    n += 1
    n_s = str(n)
    str_n = list(n_s)
    if distinct(str_n):
        i += 1
    
print(n)