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.
yr = input()
year = int(yr)+1

while True:
    yr = str(year)
    a = [int(x) for x in yr]
    if(a[2]!=a[0]!=a[1]!=a[2]!=a[3]!=a[0] and a[1]!=a[3]):
        break
    else:
        year+=1

print(yr)