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())

for i in range(N+1,9012):
    
    a=str(i)[0]
    b=str(i)[1]
    c=str(i)[2]
    d=str(i)[3]
    if a!=b and a!=c and a!=d and b!=c and b!=d and c!=d:
        print(i)
        break
