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.

def is_distinct(n):
    nums = set()
    while n > 0:
        rem = n % 10
        nums.add(rem)
        n = n // 10
    return (True if len(nums)==4 else False)
        
    
n = int(input())
n += 1
while not is_distinct(n):
    n += 1

print(n)


