import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

class RecycledNumbers{
	
	
	
	int getcount(int small,int large){
		int count = 0;
		for(int currnum = small; currnum < large; currnum++){
			int permut = currnum;
			int no_of_digits = 0;
			while(permut > 0){
				permut = permut/10;
				no_of_digits++;
			}
			int lastDigit = currnum % 10;
			permut = currnum / 10;
			permut = permut + lastDigit * (int)Math.pow(10, no_of_digits-1);
			while(permut != currnum){
				
				if(permut >= currnum && permut <= large){
					
					count++;
				}
				lastDigit = permut % 10;
				permut = permut / 10;
				permut = permut + lastDigit * (int)Math.pow(10, no_of_digits-1);
				
			}
			
		}
		
		return count;
	}
	
	public static void main(String args[]){
		RecycledNumbers d = new RecycledNumbers();
		
		int no_of_cases = 0;
		String input = "";
		
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		try{
			no_of_cases = Integer.parseInt(br.readLine());
		}
		catch(Exception e){
			System.out.println("First line is not a number");
		}
		
		for(int i=1; i <= no_of_cases;i++){
			try{
				input = br.readLine();
			}
			catch(Exception e){
				System.out.println("Number of test cases different from the number mentioned in first line");
			}
			
			System.out.print("Case #" +i+": ");
			
			StringTokenizer t =  new StringTokenizer(input);
			int small=0,large=0;
			if(t.hasMoreTokens()){
				small = Integer.parseInt(t.nextToken());
			}
			if(t.hasMoreTokens()){
				large = Integer.parseInt(t.nextToken());
			}
			System.out.println(d.getcount(small,large));
			
		}
		
		
		

	}
	
	
}
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.Scanner;
public class ProblemC {
	static long[] pow = new long[12];
	private static long solve(int a, int b) {
		HashMap<Integer, LinkedList<Integer>> f = new HashMap<Integer, LinkedList<Integer>>();
		long res = 0;
		for (int i = a; i <= b; i++) {
			int s = (i + "").length();
			for (int j = 1; j < s; j++) {
				int c = (int) ((i / pow[j]) + pow[s - j] * (i % pow[j]));
				if (c <= b && c >= a && c != i && (c + "").length() == s) {
					boolean k = f.containsKey(i);
					if (!k)f.put(i, new LinkedList<Integer>());
					if (f.containsKey(c))k = f.get(c).contains(i);
					if (!k) {f.get(i).add(c);res++;
					}
				}
			}
		}
		return res;
	}
	public static void main(String[] args) throws IOException {
		pow[1] = 10;
		for (int i = 2; i < 12; i++)
			pow[i] = pow[i - 1] * 10;
		Scanner input = new Scanner(new FileReader("input"));
		BufferedWriter output = new BufferedWriter(new FileWriter("output"));
		long res;
		int n = input.nextInt();
		for (int j = 1; j <= n; j++) {
			res = solve(input.nextInt(), input.nextInt());
			output.write("Case #" + j + ": " + res);
			output.newLine();
		}
		output.close();
	}
}