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.HashSet;
import java.util.Scanner;


public class Main {
	public static void main(String[] args) {
		Scanner r = new Scanner(System.in);
		
		int T = r.nextInt();
		int caseNumber = 1;
		while(T-- > 0){
			int A = r.nextInt();
			int B = r.nextInt();
			
			int ret = 0;
			for(int x = A; x <= B; x++){
				HashSet<Integer> S = new HashSet<Integer>();
				
				int curr = x;
				int L = (curr + "").length();
				int L10 = 1;
				for(int i = 0; i < L - 1; i++)
					L10 *= 10;
				
				for(int itr = 0; itr < L; itr++){
					if((curr + "").length() == L && !S.contains(curr) && curr <= B && curr >= A && curr < x){
						ret++;
					}
					
					S.add(curr);
					curr = R(curr, L10);
				}
			}
			
			System.out.printf("Case #%d: %d\n", caseNumber++, ret);
		}
	}
	static int R(int x, int L){
		int m = x % 10; 
		return (x / 10) + (L * m);
	}
}
