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())
list =[]
out = ''
flag = False
while year <= 9000:
    year += 1


    for i in str(year):
        if i not in list:
            list.append(i)

        if len(list) == 4:
            flag = True

    if flag != True:
        list = []
    if flag == True:
        break

for n in list:
    out+=n

print(out)