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.util.*;

class Recycle{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int testcase, A, B;
    testcase = sc.nextInt();
    for(int i=1;i<=testcase;i++){
      A = sc.nextInt();
      B = sc.nextInt();
      System.out.println("Case #"+i+": "+countpair(A,B));
    }
  }
  
  public static int countpair(int A, int B){
    int numdigit, temp = A, temp2, counter;
    int[] remember;
    counter = 0;
    while(A<=B){
      remember = new int[7];
     numdigit = (int)Math.log10((double)A) + 1;
     temp = A;
     for(int i=0;i<numdigit;i++){
       temp2 = temp%10;
       temp/=10;
       temp+=temp2*(int)Math.pow(10,numdigit-1);

       if(check(temp, A, B, remember)){
         counter++;
       }
     }
     A++;
    }
    return counter;
  }
  
  public static boolean check(int checker, int A, int B, int[] remember){
    boolean checked = false;
    boolean alreadyhave = false;
    int i = 0;
      if(checker> A && checker<=B){
        for(i=0;i<remember.length;i++){
          if(remember[i] == checker){
            alreadyhave = true;
            break;
          }
        }
        if(!alreadyhave){
          i=0;
          while(remember[i]!=0)
            i++;
          remember[i] = checker;
          checked = true;
        } 
      }
    return checked;

  }
}
  