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.
year = int(input())
do = True
sY = str('0000')
while do:
    year += 1
    sY = str('')
    sortedYear = sorted([str(year)[0],str(year)[1],str(year)[2],str(year)[3]])
    for i in range(4):
        sY += sortedYear[i]
    if sY[0] != sY[1] and sY[1] != sY[2] and str(sY[2]) != sY[3]:
        break
print(year)