package fixjava;

public class StringUtils {

	/** Repeat the given string the requested number of times. */
	public static String repeat(String str, int numTimes) {
		StringBuilder buf = new StringBuilder(Math.max(0, str.length() * numTimes));
		for (int i = 0; i < numTimes; i++)
			buf.append(str);
		return buf.toString();
	}

	/**
	 * Pad the left hand side of a field with the given character. Always adds at least one pad character. If the length of str is
	 * greater than numPlaces-1, then the output string will be longer than numPlaces.
	 */
	public static String padLeft(String str, char padChar, int numPlaces) {
		int bufSize = Math.max(numPlaces, str.length() + 1);
		StringBuilder buf = new StringBuilder(Math.max(numPlaces, str.length() + 1));
		buf.append(padChar);
		for (int i = 1, mi = bufSize - str.length(); i < mi; i++)
			buf.append(padChar);
		buf.append(str);
		return buf.toString();
	}

	/**
	 * Pad the right hand side of a field with the given character. Always adds at least one pad character. If the length of str is
	 * greater than numPlaces-1, then the output string will be longer than numPlaces.
	 */
	public static String padRight(String str, char padChar, int numPlaces) {
		int bufSize = Math.max(numPlaces, str.length() + 1);
		StringBuilder buf = new StringBuilder(Math.max(numPlaces, str.length() + 1));
		buf.append(str);
		buf.append(padChar);
		while (buf.length() < bufSize)
			buf.append(padChar);
		return buf.toString();
	}

	/** Intern all strings in an array, skipping null elements. */
	public static String[] intern(String[] arr) {
		for (int i = 0; i < arr.length; i++)
			arr[i] = arr[i].intern();
		return arr;
	}

	/** Intern a string, ignoring null */
	public static String intern(String str) {
		return str == null ? null : str.intern();
	}

}

import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.Scanner;
public class ProblemC {
	static long[] pow = new long[12];
	private static long solve(int a, int b) {
		HashMap<Integer, LinkedList<Integer>> f = new HashMap<Integer, LinkedList<Integer>>();
		long res = 0;
		for (int i = a; i <= b; i++) {
			int s = (i + "").length();
			for (int j = 1; j < s; j++) {
				int c = (int) ((i / pow[j]) + pow[s - j] * (i % pow[j]));
				if (c <= b && c >= a && c != i && (c + "").length() == s) {
					boolean k = f.containsKey(i);
					if (!k)f.put(i, new LinkedList<Integer>());
					if (f.containsKey(c))k = f.get(c).contains(i);
					if (!k) {f.get(i).add(c);res++;
					}
				}
			}
		}
		return res;
	}
	public static void main(String[] args) throws IOException {
		pow[1] = 10;
		for (int i = 2; i < 12; i++)
			pow[i] = pow[i - 1] * 10;
		Scanner input = new Scanner(new FileReader("input"));
		BufferedWriter output = new BufferedWriter(new FileWriter("output"));
		long res;
		int n = input.nextInt();
		for (int j = 1; j <= n; j++) {
			res = solve(input.nextInt(), input.nextInt());
			output.write("Case #" + j + ": " + res);
			output.newLine();
		}
		output.close();
	}
}