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.
n=input()
l=list(n)
a=''
for i in range(len(l)):
    if l[i]!='9':
        a+=str(int(l[i])+1)
    else:
        a+='0'
print(a)