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())

def distinct(year):
    result = ""
    for i in str(year):
        if i not in result:
            result += i
        else:
            continue
    if len(result) == len(str(year)):
        return True
    else:
        return False

running = True
while running != False:
    year += 1
    if distinct(year) == True:
        running = False
    
print(year)