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.*;
import java.nio.charset.Charset;
import java.nio.file.Path;
import java.util.ArrayList;

public class ReadWriter
{
    public ArrayList<String> readFile(String path){
        File file = new File(path);
        ArrayList<String> strings = new ArrayList<String>();
        BufferedReader reader = null;
        try{
            reader = new BufferedReader(new FileReader(file));
            String text = null;
            while((text=reader.readLine())!=null){
                strings.add(text);
            }
            return strings;
        }
        catch(Exception e){
            e.printStackTrace();
        }
        finally{
            try{
                if(reader!=null){
                    reader.close();
                }
            }
            catch(Exception e){
                e.printStackTrace();
            }
        }
        return null;
    }
    public void writeFile(ArrayList<String> list, String path){
        BufferedWriter out=null;
        try{
            FileWriter fstream = new FileWriter(path);
            out = new BufferedWriter(fstream);
            for(String s : list){
                out.write(s);
                out.write("\r\n");
            }
        }
        catch(Exception e){
            e.printStackTrace();
        }
        finally{
            try{
                if(out!=null){
                    out.close();
                }
            }
            catch(Exception e){
                e.printStackTrace();
            }
        }
    }
}
