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()
y=str(int(y)+1)
while(True):
    if(y[0]==y[1] or y[0]==y[2] or y[0]==y[3] or y[1]==y[2] or y[1]==y[3] or y[2]==y[3]):
        y=int(y)+1
        y=str(y)
    else:
        print(y)
        break
