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())

while True:
    n += 1
    
    a = n // 1000
    b = (n // 100) % 10
    c = (n // 10) % 10
    d = n % 10
    
    if a != b and a != c and a != d and b != c and b != d and c != d:
        print(a,b,c,d, sep = '')