import java.util.Scanner; public class Main { static int nums; static int a; static int b; public static void main(String[] args) { Scanner sc=new Scanner(System.in); while(sc.hasNext()){ a=sc.nextInt(); b=sc.nextInt(); nums=0; dfs("0",1); System.out.println(nums); } } static void dfs(String s,int index){ long n=Long.parseLong(s); if(n!=0&&n>b)return ; if(n>=a&&n<=b)nums++; for (int i = index; i <=9; i++){ dfs(s+i,i); } } }
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