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(1):
    n=n+1
    a=n%10 ;a1=n//10
    b=a1%10; b1=a1//10
    c=b1%10 ; c1=b1//10
    d=c1%10; d1=c1//10
    if(a!=b and a!=c and a!=d and b!=c and c!=d and b!=d):
        print(n)
        break
