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.
y = input()
while True:
    z = int(y) + 1
    y = str(z)
    x = set(y)
    if len (y) == len(x):
        print(y)
        break
        
        

        

        






        
        
