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.
a = int(input())
b = a + 1
hashset = set()

state = True
while state:
    for x in str(b):
        if x in hashset:
            b += 1
            hashset = set()
            break 
        else:
            hashset.add(x) 
    if len(hashset) == 4:
        print(b)
        state = False 