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=str(int(input())+1)
a,b,c,d=year[0],year[1],year[2],year[3]
while a==b or a==c or a==d or b==c or b==d or c==d:
    year=int(year)+1
    year=str(year)
    a,b,c,d=year[0],year[1],year[2],year[3]
print(year)
