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

import java.util.HashSet;

/**
 *
 * @author vandit
 */
public class RecycleNumbers {

    private HashSet<String> numbers = new HashSet<String>();
    private HashSet<String> initialTempNumbers = new HashSet<String>();
    private HashSet<String> finalTempNumbers = new HashSet<String>();

    HashSet<Pair> numberPairs = new HashSet<Pair>();


    private void findRecycledNumbers(int start, int end, int places) {


        for (int i = start; i <= end; i++) {
            String initialNumber = Integer.toString(i);
            //if (!(numbers.contains(initialNumber) || finalTempNumbers.contains(initialNumber))) {

                StringBuffer tempNumber = new StringBuffer(initialNumber);
                int len = tempNumber.length();
                int startIndexToMove = len - places;
                String tempString = tempNumber.substring(startIndexToMove);
                if ((places == 1 && tempString.equals("0")) || tempString.charAt(0) == '0') {
                    continue;
                }
                tempNumber.delete(startIndexToMove, len);
                String finalTempNumber = tempString + tempNumber.toString();

                if (! (finalTempNumber.equals(initialNumber) || Integer.parseInt(finalTempNumber) > end || Integer.parseInt(finalTempNumber) < Integer.parseInt(initialNumber))) {
                    numbers.add(initialNumber);
                    finalTempNumbers.add(finalTempNumber);
                    Pair pair = new Pair(finalTempNumber,initialNumber);
                    numberPairs.add(pair);
                }
            }

        

    }

    public HashSet<Pair> findAllRecycledNumbers(int start, int end) {
        int length = Integer.toString(start).length();
        for (int i = 1; i < length; i++) {
            findRecycledNumbers(start, end, i);
        }
        return numberPairs;
    }
}

import java.io.*;
/**
 *
 * @author ankush
 */
public class Main {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args)throws IOException {
        //System.out.println(Math.floor(Math.log10(11)));
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        int t=Integer.parseInt(br.readLine());
        int ans[]=new int[t];
        for(int i=0;i<t;i++)
        {
            String x=br.readLine();
            String r[]=new String[2];
            r=x.split(" ");
            int a=Integer.parseInt(r[0]);
            int b=Integer.parseInt(r[1]);
            int count=0;
            for(int j=a;j<=b;j++)
            {
                int p=j/10;
                int m=j%10;
                int q=(int)(Math.floor(Math.log10(j)))+1;
                for(int k=1;k<q;k++)
                {
                     int s=m*(int)(Math.pow(10.0,(q-1)*1.0))+p;
                     int n=(int)(Math.floor(Math.log10(s)))+1;
                    if(s>j && s<=b && n==q)
                    {
                        count++;
                     // System.out.println(j+" "+s+" "+count+" "+p+" "+q+" "+m);
                     }
                    m=s%10;
                    p=s/10;

                }
            }
            ans[i]=count;
        }
        for(int i=0;i<t;i++)
        {
            System.out.println("Case #"+(i+1)+": "+ans[i]);
        }
    }
}