package jp.funnything.competition.util;

import java.math.BigInteger;

/**
 * Utility for BigInteger
 */
public class BI {
    public static BigInteger ZERO = BigInteger.ZERO;
    public static BigInteger ONE = BigInteger.ONE;

    public static BigInteger add( final BigInteger x , final BigInteger y ) {
        return x.add( y );
    }

    public static BigInteger add( final BigInteger x , final long y ) {
        return add( x , v( y ) );
    }

    public static BigInteger add( final long x , final BigInteger y ) {
        return add( v( x ) , y );
    }

    public static int cmp( final BigInteger x , final BigInteger y ) {
        return x.compareTo( y );
    }

    public static int cmp( final BigInteger x , final long y ) {
        return cmp( x , v( y ) );
    }

    public static int cmp( final long x , final BigInteger y ) {
        return cmp( v( x ) , y );
    }

    public static BigInteger div( final BigInteger x , final BigInteger y ) {
        return x.divide( y );
    }

    public static BigInteger div( final BigInteger x , final long y ) {
        return div( x , v( y ) );
    }

    public static BigInteger div( final long x , final BigInteger y ) {
        return div( v( x ) , y );
    }

    public static BigInteger mod( final BigInteger x , final BigInteger y ) {
        return x.mod( y );
    }

    public static BigInteger mod( final BigInteger x , final long y ) {
        return mod( x , v( y ) );
    }

    public static BigInteger mod( final long x , final BigInteger y ) {
        return mod( v( x ) , y );
    }

    public static BigInteger mul( final BigInteger x , final BigInteger y ) {
        return x.multiply( y );
    }

    public static BigInteger mul( final BigInteger x , final long y ) {
        return mul( x , v( y ) );
    }

    public static BigInteger mul( final long x , final BigInteger y ) {
        return mul( v( x ) , y );
    }

    public static BigInteger sub( final BigInteger x , final BigInteger y ) {
        return x.subtract( y );
    }

    public static BigInteger sub( final BigInteger x , final long y ) {
        return sub( x , v( y ) );
    }

    public static BigInteger sub( final long x , final BigInteger y ) {
        return sub( v( x ) , y );
    }

    public static BigInteger v( final long value ) {
        return BigInteger.valueOf( value );
    }
}

import java.util.HashSet;
import java.util.Scanner;


public class qualifier3 {
	public static void main(String[] args)
	{

	Scanner sc = new Scanner(System.in);
	int numcases = sc.nextInt();
	sc.nextLine();
	for(int curcase = 1;curcase <=numcases;curcase++)
	{
		int min = sc.nextInt();
		int max = sc.nextInt();
		int numdigits = 0;
		for(int i=max;i>0;i/=10,numdigits++);
		int tennum =1;
		for(int i=0;i<numdigits;i++,tennum*=10);
		int count =0;
		for(int i=min;i<max;i++)
		{
			HashSet<Integer> seen = new HashSet<Integer>();
			int mult =1;
			for(int j=1;j<numdigits;j++)
			{mult*=10;
			int mine = ((i*mult)%tennum+(i/(tennum/mult)));
				if ((mine>i)&&(mine<=max)&&(!seen.contains(mine)))
					{
					count++;
					seen.add(mine);
					}
			}
		}
		sc.nextLine();
		
		
		System.out.println("Case #"+curcase+": "+count);
	
	}

	}
}
