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.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.Scanner;


public class Rec {

	static Writer out;
	static Scanner sc;
	public static void main(String[] args) throws IOException {
		sc=new Scanner(new File("input.txt"));
		out = new OutputStreamWriter(new FileOutputStream("out.txt"));
		int num_of_cases=sc.nextInt();
		int a,b;
		
		for (int i = 1; i <= num_of_cases; i++) {
			a=sc.nextInt();
			b=sc.nextInt();
			solve(a,b,i);
		}
		//System.out.println("Done");
		out.close();
	}
	private static void solve(int a, int b, int case_num) throws IOException {
		int len=String.valueOf(a).length();
		int count=0;
		int t;
		boolean [][]arr=new boolean[b+1][b+1];
		for(int i=0;i<b+1;i++){
			for (int j = 0; j < b+1; j++) {
				arr[i][j]=false;
			}
		}
		for(int k=a;k<b;k++){
			
			for (int i = 1; i <len ; i++) {			
				t=(int) (k/Math.pow(10, i) + k%Math.pow(10,i) * Math.pow(10,len-i) );
				if(t>a && t<=b && k<t){
					
					if(arr[k][t]==true){
						//System.out.println("***************************************************************************");
						count--;
					}
					arr[k][t]=true;
					count++;
					//System.out.println(a+", "+k+", "+t+", "+b);
				}
			}

		}
		//System.out.println("Case #"+case_num+": "+count);
		out.append("Case #"+case_num+": "+count+'\n');
	}
	
	

}
