/*
 * 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.util.ArrayList;
import java.util.HashMap;
import java.util.Scanner;

import javax.swing.text.html.HTMLDocument.HTMLReader.HiddenAction;


public class RecycledNumbers
{
    public static void main(String[] argStrings)
    {
        Scanner in = new Scanner(System.in);
        int num = Integer.parseInt(in.nextLine());
        String[] inputStrings = new String[num];
        String[] outputStrings = new String[num];
        for (int i = 0; i < num; i++)
        {
            inputStrings[i] = in.nextLine();
        }
        for (int i = 0; i < inputStrings.length; i++)
        {
            String[] numStrings = inputStrings[i].split(" ");
            int start = Integer.parseInt(numStrings[0]);
            int end = Integer.parseInt(numStrings[1]);
            int count = 0;
            for (int j = 0; j < end - start + 1; j++)
            {
                Integer x = start + j;
                int[] sequenceArrayInteger = reverse(x);
                for (int k = 0; k < sequenceArrayInteger.length; k++)
                {
                    int xNum = sequenceArrayInteger[k];
                    if (xNum >= start && xNum <= end)
                    {
                        count++;
                    }
                }
            }
            outputStrings[i] = "Case #" + (i + 1) + ": " + count;
        }
        
        for (String string : outputStrings)
        {
            System.out.println(string);
        }
    }
    
    public static int[] reverse(Integer num)
    {
        String string = num.toString();
        int[] retArray = new int[num.toString().length() - 1];
        for (int i = 0; i < retArray.length; i++)
        {
            char x = string.charAt(string.length() - 1);
            string = x + string.substring(0, string.length() - 1);
            if(Integer.parseInt(string) > num)
                retArray[i] = Integer.parseInt(string);
        }
        
        return retArray;
    }
}
