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 solve(year):
    number = year + 1
    
    while number <= 9000:
        str_number = str(number)
        set_number = set(str_number)
        
        if len(set_number) == 4:
            return number
        else:
            number += 1

if __name__ == "__main__":
    first_input = int(input())
    
    result = solve(first_input)
    
    print(result)