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()
x = int(y)
x += 1
y = str(x)
while y[1] == y[0] or y[2] == y[0] or y[3] == y[0] or y[1] == y[2] or y[1] == y[3] or y[2] == y[3]:
    x+=1
    y = str(x)    
print(x)