import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashSet;

public class Recycled {
    public static void main(String[] args) {
        try {
            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
            int t = Integer.parseInt(br.readLine());
            for (int i = 0; i < t; i++) {
                String[] str = br.readLine().split(" ");
                int a = Integer.parseInt(str[0]);
                int b = Integer.parseInt(str[1]);
                System.out.println("Case #" + (i + 1) + ": " + find(a, b));
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private static int find(int a, int b) {
        HashSet<Long> used = new HashSet<Long>();
        int digits = String.valueOf(a).length();
        if (digits == 1) return 0;
        for (int i = a; i <= b; i++) {
            int s = 10;
            int m = (int) Math.pow(10, digits-1);
            for (int j = 0; j < digits-1; j++) {
                int r = i % s;
                if (r < s/10) continue;
                int q = i / s;
                int rn = r * m + q;
                s *= 10; m /= 10;
                if (i != rn && rn >= a && rn <= b) {
                    long pp;
                    if (rn < i) pp = (long)rn << 30 | i;
                    else pp = (long)i << 30 | rn;
                    if (!used.contains(pp)) {
                        used.add(pp);
                    }
                }
            }
        }
        return used.size();
    }
}


import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;


public class Principal {
	
	public static void main (String Args[]){
		boolean numeros[]= new boolean[20000000];
		Scanner input = new Scanner(System.in);
		File saida = new File("c:/saida.txt");
		BufferedWriter bw;
		
		int A, B, T;
		String entrada;
		String a,b;
		String search;
		int tamanho_string, teste;
		int resposta=0, temp=0;
		String texto="";
		
		
		entrada=input.nextLine();
		T= Integer.parseInt(entrada);

		
		for(int i=1;i<=T;i++){
			
			
			
			a = input.next();
			b = input.next();
			
			A = Integer.parseInt(a);
			B = Integer.parseInt(b);
			for(int j=A; j<=B; j++){
				if(numeros[j]){
					continue;
				}
				
				numeros[j]=true;
				search = ""+j+j;
				tamanho_string= a.length();
				
				for (int k=0;k<tamanho_string-1;k++){
					teste = Integer.parseInt(search.substring(k+1, k+tamanho_string+1));
					if(teste >j && teste <=B && !numeros[teste]){
						numeros[teste]=true;
						temp++;
					}
					
					
				}
				for(;temp>0;temp--)
					resposta+=temp;
				temp=0;
				
			}
			
			
			texto="Case #"+i+": "+resposta+"\n";
			
			try {
				bw=new BufferedWriter(new FileWriter(saida, true));
				bw.write(texto);
				bw.newLine();
				bw.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
			
			

			
			
			for(int asd=0;asd<2000000;asd++)
				numeros[asd]=false;
			temp=0;
			resposta=0;
			
		}

		
	}

}
