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 check(arr_yr):
    for i in range(len(arr_yr)):
        for j in range(i+1,len(arr_yr)):
            if arr_yr[j] == arr_yr[i]:
                return False
    return True


year = int(input())
year +=1
string = str(year)
val=True
while val:
    arr_yr = [char for char in string]
    value = check(arr_yr)
    if value :
        val = False
    else:
        year +=1
        string =str(year)
print(year)
