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.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class Main {
	private static int T = 0;
	public static BufferedReader bufReader;
	public static BufferedWriter bufWriter;
	public static File wFile, rFile;

	private static int tMinLimit = 1;
	private static int tMaxLimit = 50;
	private static String rFilename = "C-small-attempt0.in";
	private static String wFilename = "OUTPUT0.txt";

	/**
	 * @param args
	 * @throws IOException
	 */
	public static void main(String[] args) throws IOException {
		// TODO Auto-generated method stub
		rFile = new File(rFilename);
		bufReader = new BufferedReader(new InputStreamReader(
				new FileInputStream(rFile), "utf8"));

		wFile = new File(wFilename);// «Ø¥ßÀÉ®×¡A·Ç³Æ¼gÀÉ
		bufWriter = new BufferedWriter(new OutputStreamWriter(
				new FileOutputStream(wFile, false), "utf8"));

		T = Integer.valueOf(bufReader.readLine().trim());
		if (tMinLimit <= T && T <= tMaxLimit) {
			for (int i = 1; i <= T; i++) {
				String[] AB = bufReader.readLine().split(" ");
				new Round1C(i, Integer.parseInt(AB[0]), Integer.parseInt(AB[1]));
			}
		}
		bufWriter.close();
	}

}