/*
 * 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.*;
class RNumber
{
 public static void main(String args[])throws Exception
 { 
    String[] output;
    BufferedReader in=new BufferedReader(new InputStreamReader(System.in));
	FileOutputStream fo=new FileOutputStream("probB.out");
	int T=Integer.parseInt(in.readLine());
	output=new String[T];
	int[][] inp=new int[T][];
	String temp="";
	for(int i=0;i<T;i++){
	temp=in.readLine();
	inp[i]=new int[]{Integer.parseInt(temp.split(" ")[0]),Integer.parseInt(temp.split(" ")[1])};
	}
	
	for(int i=0;i<T;i++){
	
	 int n=inp[i][0],m=inp[i][1],inc=0;
	 for(int nn=n;nn<=m;nn++){
		for(int mm=n;mm<=m;mm++){
		if(!(mm==nn)){
		 String nS=Integer.toString(nn);
		 String mS=Integer.toString(mm);
		 if(nS.length()==mS.length()){
		  int len=nS.length();
		  for(int ee=0;ee<len;ee++){
		   if(nS.equals(mS)){
		    inc++;
			break;
		   }else{
		    char exp=nS.charAt(0);
			String sa="";
			for(int yy=1;yy<len;yy++){
			sa+=nS.charAt(yy);
			}
			sa+=exp;
			nS=sa;
		   }
		   
		  }
		 }
		}
		}
	  }
	  output[i]="Case #"+(i+1)+": "+(inc/2);
	}
	
	   for(int d=0;d<output.length;d++){
    System.out.println(output[d]);
	if(d==output.length-1){
    fo.write((output[d]).getBytes());}
	else
	fo.write((output[d]+'\n').getBytes());
   }
 }
}