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.
def is_distinct(year):
    # Check if all digits in the year are distinct
    return len(set(str(year))) == 4

def find_next_distinct_year(year):
    year += 1
    while not is_distinct(year):
        year += 1
    return year

# Input
y = int(input())

# Output
result = find_next_distinct_year(y)
print(result)