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=int(input())
st=set()
g=str(n+1)
for i in range(n+1,100000,1):
    for j in g:
    	st.add(j)
    if len(st)==4:
    	print(g)
    	break
    else:
    	st.clear()
    	g=str(i)
    
    	
