import java.io.*;
import java.util.*;

class B
{
	public static void main(String[] args) 
	{
		try
		{
			BufferedReader br = new BufferedReader(new FileReader("B.in"));
			PrintWriter pw = new PrintWriter(new FileWriter("B.out"));
			int X = Integer.parseInt(br.readLine());

			for(int i=0; i<X; i++)
			{
				String[] S = br.readLine().split(" ");
				int A = Integer.parseInt(S[0]);
				int B = Integer.parseInt(S[1]);
				int R = 0;

				int x = 1;
				int n = 0;
				while(A/x > 0) {
					n++;
					x *= 10;
				}

				for(int j=A; j<B; j++) {
					Set<Integer> seen = new HashSet<Integer>();
					for(int k=1; k<n; k++) {
						int p1 = j % (int)Math.pow(10, k);
						int p2 = (int) Math.pow(10, n-k);
						int p3 = j / (int)Math.pow(10, k);
						int y = p1*p2 + p3;
						
						if(j < y && !seen.contains(y) && y <= B) {
							seen.add(y);
							R++;
						}
					}
				}

				pw.printf("Case #%d: %d\n", i+1, R);
				pw.flush();
			}
		}
		catch(Exception e)
		{ 
			e.printStackTrace();
		}
	}
}


import java.io.*;

public class FileReader {
    
    FileInputStream in;
    DataInputStream dis;
    BufferedReader br;
    public FileReader(File input) throws FileNotFoundException
    {
        in = new FileInputStream(input);
        dis = new DataInputStream(in);
        br = new BufferedReader(new InputStreamReader(dis));
    }
    
    public String nextString() throws IOException
    {
        return br.readLine();
    }
    
    public String[] nextStringArray() throws IOException
    {
        return br.readLine().split(" ");
    }
        
    public char nextChar() throws IOException
    {
        return (char)br.read();
    }
    
    public char[] nextCharArray() throws IOException
    {
        return br.readLine().toCharArray();
    }
    
    public int nextInt() throws IOException
    {
        return Integer.parseInt(nextString());
    }
    
    public int[] nextIntArray() throws IOException
    {
        String[] split = nextStringArray();
        int[] result = new int[split.length];
        for (int i = 0; i < split.length; i++)
        {
            result[i] = Integer.parseInt(split[i]);
        }
        return result;
    }
    
    public long nextLong() throws IOException
    {
        return Long.parseLong(nextString());
    }
    
    public long[] nextLongArray() throws IOException
    {
        String[] split = nextStringArray();
        long[] result = new long[split.length];
        for (int i = 0; i < split.length; i++)
        {
            result[i] = Long.parseLong(split[i]);
        }
        return result;
    }
            
}
