import java.util.Scanner;
import java.io.*;
import java.lang.Math;


public class C{
	public static int recycle(String str){
		String[] numbers = str.split(" ");
		int min = Integer.parseInt(numbers[0]);
		int max = Integer.parseInt(numbers[1]);
		int ret = 0;

		for(int i = min; i < max; i++){
			String num = i + "";
			int len = num.length();
			int k = i;
			for(int j = 1; j < len; j++){
				k = (k/10) + (int)java.lang.Math.pow(10.0,(double)(len-1))*(k%10);
				if (k > i && k <= max)
					ret++;
				else if(k == i)
					break;
			}
		}

		return ret;
	}

	public static void main(String[] args){
		Scanner sc = null;
		String next;
		int out;
		try{
			sc = new Scanner(new File("C-large.in"));
			int cases = Integer.parseInt(sc.nextLine());
			int current = 0;
			

			FileWriter fs = new FileWriter("output.txt");
			BufferedWriter buff = new BufferedWriter(fs);
			while(current < cases){
				next = sc.nextLine();
				current++;
				out = recycle(next);
				buff.write("Case #" + current + ": " + out + "\n");
			}
			buff.close();
		}
		catch(Exception ex){}
	}
}

import java.util.*;
import java.io.*;

public class template {

    private StringBuilder result = new StringBuilder();
    
    public static void main(String[] args) {
        new template().go();
    }

    public void go() {

        File inputFile = new File("/Users/amornchaikanokpullwad/Documents/input.in");
        BufferedReader br = null;

        try {
            br = new BufferedReader(new FileReader(inputFile));
            int numTests = Integer.parseInt(br.readLine());
            
            for (int testCounter = 0; testCounter < numTests; ++testCounter) {
                int count = 0;
                String text[] = br.readLine().split(" ");
                long A = Long.parseLong(text[0]);
                long B = Long.parseLong(text[1]);
                for (long i = A; i <= B; i++) {
                    for (int j = 1; j < Long.toString(i).length(); j++) {
                        //System.out.println(j + " " + i);
                        long temp = reverse(Long.toString(i),j);
                        if (temp <= i) continue;
                        if (temp <= B) {
                            //System.out.println(i+"+"+B);
                            count++;
                        }
                    }
                    
                    
                    //System.out.println(i+"+"+B);
                    
                    
                    
                }
                appendResult(testCounter, count);
            }
        } catch (FileNotFoundException fe) {
            fe.printStackTrace();
        } catch (IOException ie) {
            ie.printStackTrace();
        } finally {
            try {
                if (br != null) {
                    br.close();
                }
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
        writeResultToFile();
        //System.out.println(result);
    }

    private void appendResult(int testCase, int outp) {

        result.append("Case #" + (testCase+1) + ": ");
        result.append(outp+"");

        result.append("\n");
    }

    private void writeResultToFile() {
        PrintWriter pr = null;

        try {
            pr = new PrintWriter(new File("/Users/amornchaikanokpullwad/Documents/output.in"));
            pr.print(result);

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } finally {
            if (pr != null) {
                pr.close();
            }
        }
    }
    
    private long reverse(String in,int le){
       
        StringBuilder temp = new StringBuilder();
        for (int i = le; i > 0; i--) {
            //System.out.println(in);
            temp.append(in.charAt(in.length()-i));
            
        }
        for (int i = 0; i < in.length()-le; i++) {
            temp.append(in.charAt(i));
        }
        return Long.parseLong(temp.toString());
    }
}