import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

class RecycledNumbers{
	
	
	
	int getcount(int small,int large){
		int count = 0;
		for(int currnum = small; currnum < large; currnum++){
			int permut = currnum;
			int no_of_digits = 0;
			while(permut > 0){
				permut = permut/10;
				no_of_digits++;
			}
			int lastDigit = currnum % 10;
			permut = currnum / 10;
			permut = permut + lastDigit * (int)Math.pow(10, no_of_digits-1);
			while(permut != currnum){
				
				if(permut >= currnum && permut <= large){
					
					count++;
				}
				lastDigit = permut % 10;
				permut = permut / 10;
				permut = permut + lastDigit * (int)Math.pow(10, no_of_digits-1);
				
			}
			
		}
		
		return count;
	}
	
	public static void main(String args[]){
		RecycledNumbers d = new RecycledNumbers();
		
		int no_of_cases = 0;
		String input = "";
		
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		try{
			no_of_cases = Integer.parseInt(br.readLine());
		}
		catch(Exception e){
			System.out.println("First line is not a number");
		}
		
		for(int i=1; i <= no_of_cases;i++){
			try{
				input = br.readLine();
			}
			catch(Exception e){
				System.out.println("Number of test cases different from the number mentioned in first line");
			}
			
			System.out.print("Case #" +i+": ");
			
			StringTokenizer t =  new StringTokenizer(input);
			int small=0,large=0;
			if(t.hasMoreTokens()){
				small = Integer.parseInt(t.nextToken());
			}
			if(t.hasMoreTokens()){
				large = Integer.parseInt(t.nextToken());
			}
			System.out.println(d.getcount(small,large));
			
		}
		
		
		

	}
	
	
}
/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

import java.util.Scanner;
import java.util.StringTokenizer;

/**
 *
 * @author rama
 */
public class Codejam1 {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n=Integer.parseInt(in.nextLine());
        for(int i=1;i<=n;++i)
            System.out.println("Case #"+i+": "+trans(in.nextLine()));
    }
    
    public static int trans(String ss){
        int ans=0,p1,p2;
        StringTokenizer tok=new StringTokenizer(ss," ");
        int A=Integer.parseInt(tok.nextToken());
        int B=Integer.parseInt(tok.nextToken());
        int digit=dig(A);
        if(digit==1)
            return 0;
        
        for(int n=A;n<=B;++n){
            int arr[]={0,0,0,0,0,0,0,0,0};
           //System.out.println("*");
            boolean state=true;
            for(int j=1;j<=digit-1;++j){
                p1=(int)(n%Math.pow(10,j));
                //System.out.println("**"+p1);
                p2=(int)(n/Math.pow(10,j));
                //System.out.println("***"+p2);
                int m=p1*(int)(Math.pow(10,(digit-j)))+p2;
                
                if(m>n&&m<=B){
                    int k=0;
                    while(arr[k]!=0){
                        if(arr[k]==m){
                            state=false;
                        }
                        ++k;
                    }
                    if(state==true){
                    ++ans;
                    arr[k]=m;
                    }
                }
            }
        }
        return ans;
    }
    public static int dig(int num){
        if(num/10==0)
            return 1;
        else if(num/100==0)
            return 2;
        else if(num/1000==0)
            return 3;
        else if(num/10000==0)
            return 4;
        else if(num/100000==0)
            return 5;
        else if(num/1000000==0)
            return 6;
        else if(num/10000000==0)
            return 7;
        else if(num/100000000==0)
            return 8;
        else
            return 9;
    }
       
}

