/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package recyclednumbers;

import java.util.HashSet;

/**
 *
 * @author vandit
 */
public class RecycleNumbers {

    private HashSet<String> numbers = new HashSet<String>();
    private HashSet<String> initialTempNumbers = new HashSet<String>();
    private HashSet<String> finalTempNumbers = new HashSet<String>();

    HashSet<Pair> numberPairs = new HashSet<Pair>();


    private void findRecycledNumbers(int start, int end, int places) {


        for (int i = start; i <= end; i++) {
            String initialNumber = Integer.toString(i);
            //if (!(numbers.contains(initialNumber) || finalTempNumbers.contains(initialNumber))) {

                StringBuffer tempNumber = new StringBuffer(initialNumber);
                int len = tempNumber.length();
                int startIndexToMove = len - places;
                String tempString = tempNumber.substring(startIndexToMove);
                if ((places == 1 && tempString.equals("0")) || tempString.charAt(0) == '0') {
                    continue;
                }
                tempNumber.delete(startIndexToMove, len);
                String finalTempNumber = tempString + tempNumber.toString();

                if (! (finalTempNumber.equals(initialNumber) || Integer.parseInt(finalTempNumber) > end || Integer.parseInt(finalTempNumber) < Integer.parseInt(initialNumber))) {
                    numbers.add(initialNumber);
                    finalTempNumbers.add(finalTempNumber);
                    Pair pair = new Pair(finalTempNumber,initialNumber);
                    numberPairs.add(pair);
                }
            }

        

    }

    public HashSet<Pair> findAllRecycledNumbers(int start, int end) {
        int length = Integer.toString(start).length();
        for (int i = 1; i < length; i++) {
            findRecycledNumbers(start, end, i);
        }
        return numberPairs;
    }
}

import java.io.*;
import java.util.*;
import java.math.*;
public class Solution {
	public static void main(String args[]) throws Exception {
		Scanner sc = new Scanner(System.in);
		int T = sc.nextInt();
		for(int t = 0; t < T; t++) {
			int A=sc.nextInt();
			int B=sc.nextInt();
			int dig=digi(A);
			int mdig=minDig(A);
			int mdig10=mdig*10;
			int curr=A;
			int count=0;
			//System.out.println(A+" "+B+" "+dig+" "+mdig+" "+mdig10+" "+curr);
			HashSet<Long> set = new HashSet<Long>(); 
			while(curr<=B) {
				int curr2=curr;
				for(int i=0;i<dig;i++) {
					int lastdig=curr2%10;
					curr2=curr2/10+lastdig*mdig;
					if(lastdig!=0&&curr<curr2&&curr2<=B) {
						long uniq=curr*200000001L+curr2;
						if(!set.contains(uniq)) {
							set.add(uniq);
							count++;
						}
					}
					//System.out.println(curr+ " "+curr2);
				}
				curr++;
				if(curr==mdig10) {
					mdig*=10;
					mdig10*=10;
					dig++;
				}
			}
			System.out.println("Case #"+(t+1)+": "+count);
		}
	}
	static int digi(int i) {
		int n=0;
		while(i>9) {
			i/=10;
			n++;
		}
		return n;
	}
	static int minDig(int i) {
		int n=1;
		while(i>9) {
			i/=10;
			n*=10;
		}
		return n;
	}
}
