import java.io.*;
import java.util.*;

class B
{
	public static void main(String[] args) 
	{
		try
		{
			BufferedReader br = new BufferedReader(new FileReader("B.in"));
			PrintWriter pw = new PrintWriter(new FileWriter("B.out"));
			int X = Integer.parseInt(br.readLine());

			for(int i=0; i<X; i++)
			{
				String[] S = br.readLine().split(" ");
				int A = Integer.parseInt(S[0]);
				int B = Integer.parseInt(S[1]);
				int R = 0;

				int x = 1;
				int n = 0;
				while(A/x > 0) {
					n++;
					x *= 10;
				}

				for(int j=A; j<B; j++) {
					Set<Integer> seen = new HashSet<Integer>();
					for(int k=1; k<n; k++) {
						int p1 = j % (int)Math.pow(10, k);
						int p2 = (int) Math.pow(10, n-k);
						int p3 = j / (int)Math.pow(10, k);
						int y = p1*p2 + p3;
						
						if(j < y && !seen.contains(y) && y <= B) {
							seen.add(y);
							R++;
						}
					}
				}

				pw.printf("Case #%d: %d\n", i+1, R);
				pw.flush();
			}
		}
		catch(Exception e)
		{ 
			e.printStackTrace();
		}
	}
}

import java.io.*;
import java.util.*;
public class Main{
    public static void main (String[] args) throws java.lang.Exception{
      Scanner in = new Scanner(System.in);
      int T=in.nextInt();
      int res[]=new int[T];

      for(int t=0;t<T;t++){
          int A=in.nextInt();
          int B=in.nextInt();
          for(int i=A;i<=B;i++){
              HashSet<Integer> hs=new HashSet<Integer>();
              String tt=i+"";
              int lenT=tt.length();
              int len=lenT-1;
              int temp=i;
              while(len>0){
                  len--;
                  int rem=temp%10;
                  temp=temp/10;
                  if(rem!=0)
                    temp=rem*(int)Math.pow(10,lenT-1)+temp;
                  if(temp<=B && temp>i){  
                        hs.add(temp);
                  }
              }
              res[t]+=hs.size();
          }
      }
      for(int i=0;i<T;i++){
          System.out.println("Case #"+(i+1)+": "+res[i]);
      }

     
    }
}