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()
y1 = int(y)+1
y = str(y1)
while (y[0]!=y[1])+(y[0]!=y[2])+(y[0]!=y[3])\
    +(y[1]!=y[2])+(y[1]!=y[3])+(y[2]!=y[3])!=6:
    y1 += 1
    y = str(y1)
print(y)