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.*;
import java.util.*;

public class CodeJamC
{

	private static int noOfDigits(int number)
	{
		int noOfDigits = 0;
		while (number > 0)
		{
			number /= 10;
			noOfDigits++;
		}
		return noOfDigits;
	}

	private static int pow(int exponent)
	{
		int power = 1;
		for (int mulitply = 1; mulitply <= exponent; mulitply++)
			power *= 10;
		return power;
	}

	private static int countPairs(int A, int B)
	{

		int noOfDigits = noOfDigits(A);
		int noOfPairs = 0;
		int places = pow(noOfDigits);
		for (int next = A; next < B; next++)
		{
			HashSet<Integer> used = new HashSet<Integer>();
			// System.out.println("Next "+ next);
			for (int back = 10; back < places; back *= 10)
			{
				int recycled = shift(next, back, places / back);
				// System.out.println("Back: " + back + "RC " + recycled);
				if (recycled > next && recycled <= B)
				{
					// System.out.println(next +", " + recycled);
					if (!used.contains(recycled))
					{
						used.add(recycled);
						noOfPairs++;
					}
				}
			}
		}

		return noOfPairs;
	}

	private static int shift(int number, int back, int front)
	{
		return (number % back) * front + number / back;
	}

	/**
	 * @param args
	 */
	public static void main(String[] args) throws IOException
	{
		String fileName = "C-large";
		Scanner in = new Scanner(new File(fileName + ".in"));
		PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(
				fileName + ".out")));

		// Keep track of time for efficiency
		long startTime = System.currentTimeMillis();
		// Process each of the test cases
		int noOfCases = in.nextInt();

		for (int caseNo = 1; caseNo <= noOfCases; caseNo++)
		{
			int A = in.nextInt();
			int B = in.nextInt();

			int noOfPairs = countPairs(A, B);

			System.out.println("Case #" + caseNo + ": " + noOfPairs);
			out.println("Case #" + caseNo + ": " + noOfPairs);
		}

		System.out.println("Done");
		long stopTime = System.currentTimeMillis();
		System.out.println("Time: " + (stopTime - startTime) / 1000.0);

		// Close the files
		in.close();
		out.close();
	}
}
