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