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.
lst = []; 
x = int(input())

for i in range(x,1000000):
    count = 0
    i = str(i)
    for j in i:
        if i.count(j) != 1:
            break
        else:
            count+=1
                
    if count == 4:
        lst.append(int(i))
        if int(i)>x:
            break
    

print(lst[-1])
 				  	    			    	 		 	 	  	