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.util.Scanner;


public class Main {
	static int move(int n, int p){
		return (n%10)*(int)Math.pow(10, p) + n/10;
	}
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int T = sc.nextInt();
		
		for(int t=1; t<=T; t++){
			int out=0;
			int A=sc.nextInt();
			int B=sc.nextInt();
			int p = (int)Math.log10((double)A);
			
			for(int n=A; n<B; n++) {
				int m = n;
				for(int i=0; i<=p; i++){
					m = move(m,p);
					if(n<m && m<=B)
						out++;
				}
			}
			System.out.println("Case #"+t+": "+out);
		}
	}
}
