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.
sal=int(input())
size=True

while size:
    sal=sal+1
    a=(int)(sal/1000)
    b=int((sal/100)%10)
    c=int((sal%100)/10)
    d=int(sal%10)
    if(a!=b and a!=c and a!=d and b!=c and b!=d and c!=d):
        print(sal)
        size=False
    else:
        
        size=True
