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())
ans,a,b,c,d = 0,0,0,0,0
while(True):
    n = n + 1
    ans = n
    a = n%10
    n = n//10
    b = n%10
    n = n//10
    c = n%10
    n = n//10
    d = n%10
    if(a != b and a != c and a != d and b != c and b != d and c != d):
        print(ans)
        break
    
    n = ans