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())
distinctYear = year + 1
while(True):
    distinctYear = str(distinctYear)
    if distinctYear[0] == distinctYear[1]:
        distinctYear = int(distinctYear) + 1
    elif distinctYear[0] == distinctYear[2]:
        distinctYear = int(distinctYear) + 1
    elif distinctYear[0] == distinctYear[3]:
        distinctYear = int(distinctYear) + 1
    elif distinctYear[1] == distinctYear[2]:
        distinctYear = int(distinctYear) + 1
    elif distinctYear[1] == distinctYear[3]:
        distinctYear = int(distinctYear) + 1
    elif distinctYear[2] == distinctYear[3]:
        distinctYear = int(distinctYear) + 1
    else:
        distinctYear = int(distinctYear)
        break
    
print(distinctYear)