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.
v = int(input())
v += 1
s = list(map(int, str(v)))
i = 0
while i == 0:
    m = list(map(int, str(v)))
    if m[0] != m[1] and m[0] != m[2] and m[0] != m[3] and m[1] != m[2] and m[1] != m[3] and m[2] != m[3]:
        i += 1
    
    else:
        v += 1

print(v)