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.util.*;


public class Recycled {
	public static void main (String[] args) { 
		Scanner sc = new Scanner(System.in);
		int lines = sc.nextInt();
		for (int i=0; i<lines; i++) {
			int min = sc.nextInt();
			int max = sc.nextInt();
			
			int count = 0;
			for (int n=min; n<=max; n++) {
				int d = countDigit(n);
				ArrayList<Integer> swappedValues = new ArrayList<Integer>();
				for (int s=1; s<=d; s++) {
					int tens = tenPowerOf(s);
					int headDigits = d-s;
					int head = n/tens;
					int tail = n%tens;
					
					int minTail = minWithNumberOfDigits(s);
					if (tail>=minTail) {
						int newNum = tail*tenPowerOf(headDigits)+head;
						if (newNum>=min && newNum<=max && newNum!=n) {
							int size = swappedValues.size();
							Boolean isNew = true;
							for (int j=0; j<size; j++) {
								int val = swappedValues.get(j);
								if (val==newNum) {
									isNew = false;
									break;
								}
							}
							if (isNew) {
								swappedValues.add(newNum);
								count++;
							}
						}
					}
				}
			}
			
			count /= 2;
			System.out.println("Case #"+(i+1)+": "+count);
		}
	}
	
	static int countDigit (int n) {
		int digits = 1;
		n = n/10;
		while (n>0) {
			digits++;
			n = n/10;
		}
		return digits;
		
	}
	
	static int tenPowerOf(int p) {
		int res = 0;
		if (p>0) {
			res = 10; // power of 1
			for (int i=2; i<=p; i++) {
				res *= 10;
			}
		}
		return res;
	}
	
	static int minWithNumberOfDigits(int d) {
		return tenPowerOf(d-1);
	}
}
