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 get_input():
    year = int(input())
    return year
    
def check_year(year):
    year_string = str(year)
    if len(year_string) == len(set(year_string)):
        return True
    else:
        return False
    
def run_code(year):
    test_year = year + 1
    while check_year(test_year) == False:
        test_year += 1
    print(test_year)
    
    
if __name__ == '__main__':
    year = get_input()
    run_code(year)