import java.io.*;
import java.math.BigInteger;
import java.util.*;

import org.jfree.data.function.PowerFunction2D;

public class r2a
{

	Map numMap = new HashMap();
    int output = 0;

    /**
     * @param args
     */
    public static void main(String[] args)
    {
        r2a mk = new r2a();
        try {
            FileInputStream fstream = new FileInputStream("d:/cjinput.txt");
            DataInputStream in = new DataInputStream(fstream);
            BufferedReader br = new BufferedReader(new InputStreamReader(in));
            String str;
            int i = 0;
            while ((str = br.readLine()) != null) {
            	int begin=0,end = 0;
                i++;
                if (i == 1)
                    continue;
                mk.numMap = new HashMap();
                StringTokenizer strTok = new StringTokenizer(str, " ");
                while (strTok.hasMoreTokens()) {
                	begin =  Integer.parseInt(((String) strTok.nextToken()));
                    end = Integer.parseInt(((String) strTok.nextToken()));
                }

                mk.evaluate(i, begin, end);

            }
            in.close();
        }
        catch (Exception e) {
            System.err.println(e);
        }

    }

    private void evaluate(int rowNum, int begin, int end)
    {
    	output=0;
    	for (int i = begin; i<= end; i++) {
    		if(numMap.containsKey(Integer.valueOf(i)))
    			continue;
    		List l = getPairElems(i);
    		if (l.size() > 0) {
    			Iterator itr = l.iterator();
    			int ctr = 0;
    			ArrayList tempList = new ArrayList();
    			while (itr.hasNext()) {
    				int next = ((Integer)itr.next()).intValue();
    				if (next <= end && next > i) {
    					numMap.put(Integer.valueOf(next), i);
    					tempList.add(next);
    					ctr++;
    				}
    			}
    			ctr = getCounter(ctr+1,2);
/*    			if (tempList.size() > 0 || ctr > 0)
    				System.out.println("DD: " + i + ": " + tempList +" ; ctr = " + ctr);*/
    			output = output + ctr;
    		}
    		
    	}

        String outputStr = "Case #" + (rowNum -1) + ": " + output;
        
        System.out.println(outputStr);
    }

	private int getCounter(int n, int r) {
		int ret = 1;
		int nfactorial =1;
		for (int i = 2; i<=n; i++) {
			nfactorial = i*nfactorial;
		}
		int nrfact =1;
		for (int i = 2; i<=n-r; i++) {
			nrfact = i*nrfact;
		}
		
		return nfactorial/(2*nrfact);
	}

	private ArrayList getPairElems(int num) {
		ArrayList retList = new ArrayList();
		int temp = num;
		if (num/10 == 0)
			return retList;
		
		String str = String.valueOf(num);
		
		int arr[] = new int[str.length()];
		int x = str.length();
		while (temp/10 > 0) {
			arr[x-1] = temp%10;
			temp=temp/10;
			x--;
		}
		arr[0]=temp;
		
		int size = arr.length;
		for (int pos = size -1; pos >0; pos--) {
			if(arr[pos] == 0)
				continue;
			int pairNum = 0;
			int multiplier =1;
			for (int c=0; c < size-1; c++) {
				multiplier = multiplier*10;
			}
			pairNum = pairNum + (arr[pos]*multiplier);
			for(int ctr = pos+1, i=1; i < size; i++,ctr++) {
				if (ctr == size)
					ctr=0;
				if (multiplier!=1)
					multiplier=multiplier/10;
				pairNum = pairNum + (arr[ctr]*multiplier);
			}
			if (pairNum != num)
				retList.add(Integer.valueOf(pairNum));			
		}
		
		return retList;
	}
}

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class TestB {
	private final static String DAT_PATH = "/Users/ttsurumi/Downloads/";

//	private final static String dat = "A-sample-practice.in";
//	private final static String dat = "A-small-practice.in";
//	private final static String dat = "B-sample.in";
	private final static String dat = "C-large.in";
	 
	public static String datPath = DAT_PATH + dat;
	public static String ansPath = DAT_PATH + dat + ".ans";
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		try{
			BufferedReader br = new BufferedReader(new FileReader(datPath));
			BufferedWriter bw = new BufferedWriter(new FileWriter(ansPath));
            String[] movCounts = br.readLine().split(" ");
            String tmp_str;
            int count = 1;
            while((tmp_str = br.readLine()) != null){
            	String[] row = tmp_str.split(" ");
            	long min = Long.parseLong(row[0]);
            	long max = Long.parseLong(row[1]);
            	int width = row[0].length();
            	bw.write("Case #" + count + ": " );
            	long ans = 0;
     //       	System.out.println("min = " + min + ", max = " + max + ", width" + width);
               	for(long i = min; i < max; i++){
            		long t= check(i,min,max,width);
            		ans += t;
//            		if(t != 0)System.out.println("ans = " + ans + ", t = " + t);
               	}
            	bw.write(ans+"");
            	bw.newLine();
            	count++;
            }
            bw.flush();
		}catch(IOException e){
			System.err.println(e);
		}
	}
	private static long check(long l,long min, long max, int width){
		long count = 0;
		long next = (long)Math.pow(10, width-1);
		long t = l % 10;
		long h = l / 10;
		long shift = h + t * next;
		if(shift == l )return 0;
		shift=l;
		for(int i = 0; i < width - 1; i++){
			t = shift % 10;
			h = shift / 10;
			shift = h + t * next;
			if(min < shift && l < shift && shift <= max ){
		//		System.out.println("l = " + l + ", ans" + shift);
				count++;
			}
		}
		return count;
	}
}
