import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class Q3M {
	public static void main(String[] args) throws Exception {
		compute();
	}

	private static void compute() throws Exception {
		BufferedReader br = new BufferedReader(new FileReader(new File(
				"C:\\work\\Q3\\C-small-attempt0.in")));
		String line = null;
		int i = Integer.parseInt(br.readLine());
		List l = new ArrayList();
		for (int j = 0; j < i; j++) {
			line = br.readLine();
			String[] nums = line.split(" ");
			l.add(calculate(nums));
		}
		writeOutput(l);
	}

	private static int calculate(String[] nums) {
		int min = Integer.parseInt(nums[0]);
		int max = Integer.parseInt(nums[1]);
		int count = 0;
		List l = new ArrayList();
		for (int i = min; i <= max; i++) {
			for (int times = 1; times < countDigits(i); times++) {
				int res = shiftNum(i, times);
				if (res <= max && i < res) {
					if ((!l.contains((i + ":" + res)))) {
						l.add(i + ":" + res);
						l.add(res + ":" + i);
						count++;
					}
				}
			}
		}
		return count;
	}

	private static boolean checkZeros(int temp, int res) {
		if (temp % 10 == 0 || res % 10 == 0)
			return false;
		return true;
	}

	private static int shiftNum(int n, int times) {
		int base = (int) Math.pow(10, times);
		int temp2 = n / base;
		int placeHolder = (int) Math.pow((double) 10,
				(double) countDigits(temp2));
		int res = placeHolder * (n % base) + temp2;
		if (countDigits(res) == countDigits(n)) {
			return res;
		} else {
			return 2000001;
		}
	}

	public static int countDigits(int x) {
		if (x < 10)
			return 1;
		else {
			return 1 + countDigits(x / 10);
		}
	}

	private static void writeOutput(List l) throws Exception {
		StringBuffer b = new StringBuffer();
		int i = 1;
		BufferedWriter br = new BufferedWriter(new FileWriter(new File(
				"C:\\work\\Q3\\ans.txt")));
		for (Iterator iterator = l.iterator(); iterator.hasNext();) {
			br.write("Case #" + i++ + ": " + iterator.next());
			br.newLine();
		}
		br.close();
	}

}
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;

@SuppressWarnings( "nls" )
public class R0C
{
  public static void main( final String[] args ) throws IOException
  {
    final Scanner in = new Scanner( new File( "R0C.txt" ) );
    final FileWriter out = new FileWriter( "R0C.out" );

    final int n = in.nextInt();
    in.skip( in.delimiter() );

    for( int i = 0; i < n; i++ )
      out.write( "Case #" + (i+1) + ": " + countAllRecycledNumbersBetween( in.nextInt(), in.nextInt() ) + "\n" );

    in.close();
    out.close();
  }

  static int countAllRecycledNumbersBetween( final int a, final int b )
  {
    final int digits = 1 + (int)Math.floor( Math.log10( a ) );
    final int firstDigitMult = (int)Math.pow( 10., digits - 1 );

    final boolean[] visited = new boolean[ b - a + 1 ];
    int count = 0;

    for( int i = 0; i <= b - a; i++ )
    {
      if( visited[ i ] ) continue;
      visited[ i ] = true;
      int subCount = 1;

      int x = a + i;

      for( int j = 1; j < digits; j++ )
      {
        x = x / 10 + x % 10 * firstDigitMult;

        if( ( x >= a ) && ( x <= b ) && !visited[ x - a ] )
        {
          visited[ x - a ] = true;
          subCount++;
        }
      }

      count += subCount * ( subCount - 1 ) / 2;
    }

    return count;
  }
}
