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.
input_year = int(input())
output_year = input_year
change = 0
xdigit = 0
record = 0
while True:
    output_year += 1
    change = str(output_year)
    record = 0
    for i in range(len(change)):
        xdigit = change.replace(change[i],'')
        if len(xdigit) == len(change)- 1:
            record += 1
    if record >= 4:
        break

        
print(output_year)
