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.
y = int(input())
n = y+1
n = str(n)

while 1:
    if n[0]!=n[1] and n[0]!=n[2] and n[0]!=n[3] and n[1]!=n[2] and n[1]!=n[3] and n[2]!=n[3]:
        print(int(n))
        break
        
    else:
        y+=1
        n=str(y)
        continue
		 		  	 			   		 				     		