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.util.TreeSet;


public class SolveThread implements Runnable{
	
	private TreeSet<Integer> nbs;
	int pairs = 0, casenb;
	private ThreadDispatcher td;
	private int A, B;
	
	public SolveThread(int A, int B, int casenb, ThreadDispatcher td){
		nbs = new TreeSet<Integer>();
		this.A = A;
		this.B = B;
		for(int i = A; i <= B; i++){
			nbs.add(i);
		}
		this.casenb = casenb;
		this.td = td;
	}
	
	public void solve(){
		while(!nbs.isEmpty()){
			int n = nbs.first();
			findAndRemoveRecycledOf(n);
		}
	}

	private void findAndRemoveRecycledOf(int n) {
		nbs.remove((Integer)n);
		String nstr = "" + n;
		if(nstr.length() == 1)
			return;
		int nbInPair = 1;
		for(int i = 0; i < nstr.length()-1;i++){
			String sstr = shiftRight(nstr,i);
			sstr.replaceFirst("^0+(?!$)", "");
			int sn = Integer.parseInt(sstr);
			if(nbs.contains(sn)){
				nbInPair++;
				nbs.remove((Integer)sn);
			}
		}
		pairs += nbInPair * (nbInPair - 1) / 2;
	}

	private String shiftRight(String nstr, int i) {
		return nstr.substring(nstr.length() - 1 - i, nstr.length()) +  nstr.substring(0, nstr.length() - 1 - i);
	}

	@Override
	public void run() {
		solve();
		td.finish(this);
	}

}
