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.FileReader;
import java.util.Scanner;


public class Main {

	/**
	 * @param args
	 */
	
	public static int numShift(int A, int digit){

		int num = 0, div;
		num = A %10;
		div = A /10;
		for(int i=1; i < digit ; i++)
		{
			num = num*10;
		}
		num = num + div;
		return num;
	}
	

	public static int recycleCount(int A, int B)
	{
		int count = 0;
		int num = A;
		String digit = "" + A;
		do
		{
			num = numShift(num, digit.length());
			if(num > A && num <= B)
				count++;
		}while(num != A);
		
		//System.out.print("Count: " + count + "\n");
		return count;
	}
	
	public static void runCase(int A, int B, int casenum)
	{
		int count =0;
		for(int i=A; i<B; i++)
		{
			count += recycleCount(i, B);
		}
		System.out.print("Case #" + casenum + ": " + count + "\n");
	}
	
	public static void main(String[] args) throws FileNotFoundException {
		File ffile = new File(args[0]);
		Scanner scanner;
		scanner = new Scanner(new FileReader(ffile));
		
		int N = scanner.nextInt();
		int A, B;
		for(int i =0; i<N; i++)
		{
			A = scanner.nextInt();
			B = scanner.nextInt();
			runCase(A, B, i+1);
		}
		
	}

}
