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.
def norepeat(a):
     if len(set(str(a)))==len(str(a)):
              return true
      else:
               return false
a=int(input())
while(true):
         a+=1
          if norepeat(a):
               print(n)
               break;

	 		 	 	  	 	 			 	  	 	  			 	