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.*;
import java.util.*;
public class Prob3 {
	public static PrintStream out;
	public static int caseNum;
	public static void main(String[] args) throws IOException {
		Scanner sc = new Scanner(new File("in.txt"));
		out = new PrintStream(new File("out.txt"));
		int numCases = Integer.parseInt(sc.nextLine());
		caseNum = 0;
		for(int i=0; i<numCases; i++)
			solve(sc.nextLine());
	}
	public static void solve(String input){
		StringTokenizer st = new StringTokenizer(input, " ");
		int from = Integer.parseInt(st.nextToken());
		int to = Integer.parseInt(st.nextToken());
		int numDigits = (int) Math.floor(Math.log10(from)) + 1;
		int digitsPow10 = (int) Math.pow(10, numDigits-1);
		int numPairs = 0;
		for(int i=from; i<=to; i++){
			int recycled = recycle(i, digitsPow10);
			while(recycled != i){
				if(recycled>=from && recycled<=to)
					numPairs++;
				recycled = recycle(recycled, digitsPow10);
			}
		}
		caseNum++;
		out.println("Case #"+caseNum+": "+(numPairs/2));
	}
	public static int recycle(int num, int digitsPow10){
		while(true){
			int lastDigit = num%10;
			num = lastDigit*digitsPow10 + num/10;
			if(lastDigit!=0)
				break;
		}
		return num;
	}
}