import java.util.Scanner;
import java.io.*;
import java.lang.Math;


public class C{
	public static int recycle(String str){
		String[] numbers = str.split(" ");
		int min = Integer.parseInt(numbers[0]);
		int max = Integer.parseInt(numbers[1]);
		int ret = 0;

		for(int i = min; i < max; i++){
			String num = i + "";
			int len = num.length();
			int k = i;
			for(int j = 1; j < len; j++){
				k = (k/10) + (int)java.lang.Math.pow(10.0,(double)(len-1))*(k%10);
				if (k > i && k <= max)
					ret++;
				else if(k == i)
					break;
			}
		}

		return ret;
	}

	public static void main(String[] args){
		Scanner sc = null;
		String next;
		int out;
		try{
			sc = new Scanner(new File("C-large.in"));
			int cases = Integer.parseInt(sc.nextLine());
			int current = 0;
			

			FileWriter fs = new FileWriter("output.txt");
			BufferedWriter buff = new BufferedWriter(fs);
			while(current < cases){
				next = sc.nextLine();
				current++;
				out = recycle(next);
				buff.write("Case #" + current + ": " + out + "\n");
			}
			buff.close();
		}
		catch(Exception ex){}
	}
}
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.HashSet;
import java.util.Scanner;
import java.util.Set;


public class Task3 {
	private int parseLine(Scanner scanner) throws IOException {
		int A = scanner.nextInt();
		int B = scanner.nextInt();
		int c = ("" + A).length();
		int pow = (int) Math.pow(10, c - 1);
		int count = 0;
		for (int m = A; m < B; m++) {
			int tmpN = m;
			Set<Integer> set = new HashSet<Integer>();
			for (int j = 0; j < c - 1; j++) {
				tmpN = tmpN / 10 + (tmpN % 10) * pow;
				if (m < tmpN && tmpN <= B && !set.contains(tmpN)) {
					set.add(tmpN);
					count++;
				}
			}
		}
		return count;
	}
	
	public void run(Scanner scanner, Writer bw) throws IOException {
		int rowCnt = scanner.nextInt();
		for (int i = 0; i < rowCnt; i++) {
			bw.write("Case #" + (i + 1) + ": " + parseLine(scanner) + '\n');
		}
		bw.flush();
		bw.close();
	}
	
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		try {
			Scanner scanner = new Scanner(System.in);
			scanner.useDelimiter(" |\r\n|\n|\r");
			new Task3().run(new Scanner(System.in),
					new OutputStreamWriter(System.out));
		} catch (IOException e) {
			return;
		}
	}
}
