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.
y = int(input())
n = y+1

while True:
    a = n%10
    x = n//10
    b = x%10
    y = x//10
    c = y%10
    z = y//10
    d = z%10
    
    if a!=b and a!=c and a!=d and b!=c and b!=d and c!=d:
        print(d,end="")
        print(c,end="")
        print(b,end="")
        print(a,end="")
        break
    n += 1
        