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 ii in range(int(n)+1,9000) :
    m = set(str(ii))
    if len(m) == len(str(n)) : 
        print(ii)
        break
    else :
        continue  
    
    




