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

import static java.lang.Math.*;
import static java.util.Arrays.*;
import static java.util.Collections.*;

public class C{
	Scanner sc=new Scanner(System.in);

	int INF=1<<28;
	double EPS=1e-9;

	int caze, T;
	int A, B;

	void run(){
		T=sc.nextInt();
		for(caze=1; caze<=T; caze++){
			A=sc.nextInt();
			B=sc.nextInt();
			solve();
		}
	}

	void solve(){
		int ans=0;
		for(int n=A; n<=B; n++){
			int digit=(int)(log10(n)+EPS);
			int d=(int)pow(10, digit);
			// debug("n", n);
			for(int m=rot(n, d); m!=n; m=rot(m, d)){
				// debug("m", m);
				if(n<m&&m<=B){
					ans++;
				}
			}
		}
		answer(ans+"");
	}

	int rot(int n, int d){
		return n/10+n%10*d;
	}

	void answer(String s){
		println("Case #"+caze+": "+s);
	}

	void println(String s){
		System.out.println(s);
	}

	void print(String s){
		System.out.print(s);
	}

	void debug(Object... os){
		System.err.println(deepToString(os));
	}

	public static void main(String[] args){
		try{
			System.setIn(new FileInputStream("dat/C-small.in"));
			System.setOut(new PrintStream(new FileOutputStream("dat/C-small.out")));
		}catch(Exception e){}
		new C().run();
		System.out.flush();
		System.out.close();
	}
}


import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
/**
 *
 * @author Chung Lee
 */
public class RecycleNumber {
    
    public static void Main(String[] args) throws FileNotFoundException {

        Scanner scanner = new Scanner(new File(args[0]));
        
        PrintWriter writer = new PrintWriter(args[1]);

        int noCase = scanner.nextInt();

        for (int i = 0; i < noCase; i++) {
            int A = scanner.nextInt();
            int B = scanner.nextInt();

            int noRecyclePair = 0;
            for (int j = A; j <= B; j++) {
                noRecyclePair += getNoRecyclePair(j, A, B);
            }

            noRecyclePair /= 2;

            System.out.print(String.format("Case #%d: %d", i + 1, noRecyclePair));
            writer.print(String.format("Case #%d: %d", i + 1, noRecyclePair));

            if (i != noCase - 1) {
                System.out.println();
                writer.println();
            }
        }
        writer.close();
    }

    public static int getNoRecyclePair(int num, int A, int B) {
        int temp = num;
        int digits = 0;
        while (temp != 0) {
            temp /= 10;
            digits++;
        }

        int noRecyclePair = 0;
        
        
        for (int i = 1; i <= digits; i++) {
            int recycleNum = (int) ((num % Math.pow(10, i)) * Math.pow(10, digits - i)
                    + (num / Math.pow(10, i)));
            if (recycleNum != num
                    && recycleNum >= A
                    && recycleNum <= B) {
                noRecyclePair++;
                    
            }
        }

        return noRecyclePair;

    }
}
