import java.util.*;
import java.lang.*;
import java.math.*;
import java.io.*;

import static java.lang.Math.*;
import static java.util.Arrays.*;
import static java.util.Collections.*;

public class C{
	Scanner sc=new Scanner(System.in);

	int INF=1<<28;
	double EPS=1e-9;

	int caze, T;
	int A, B;

	void run(){
		T=sc.nextInt();
		for(caze=1; caze<=T; caze++){
			A=sc.nextInt();
			B=sc.nextInt();
			solve();
		}
	}

	void solve(){
		int ans=0;
		for(int n=A; n<=B; n++){
			int digit=(int)(log10(n)+EPS);
			int d=(int)pow(10, digit);
			// debug("n", n);
			for(int m=rot(n, d); m!=n; m=rot(m, d)){
				// debug("m", m);
				if(n<m&&m<=B){
					ans++;
				}
			}
		}
		answer(ans+"");
	}

	int rot(int n, int d){
		return n/10+n%10*d;
	}

	void answer(String s){
		println("Case #"+caze+": "+s);
	}

	void println(String s){
		System.out.println(s);
	}

	void print(String s){
		System.out.print(s);
	}

	void debug(Object... os){
		System.err.println(deepToString(os));
	}

	public static void main(String[] args){
		try{
			System.setIn(new FileInputStream("dat/C-small.in"));
			System.setOut(new PrintStream(new FileOutputStream("dat/C-small.out")));
		}catch(Exception e){}
		new C().run();
		System.out.flush();
		System.out.close();
	}
}

public class ProblemC extends FileWrapper {

	private int A[] = null;
	private int B[] = null;
	private int digt[] = null;
	
	public ProblemC(String fileName) {
		this.processInput(fileName);
		this.calculate();
		this.processOutput(OUTPUT);
	}

	@Override
	protected void processInput(String fileName) {
		try {
			this.openReadFile(fileName);
			this.caseNum = Integer.parseInt(this.readLine());
			this.output = new String[this.caseNum];
			this.A = new int[this.caseNum];
			this.B = new int[this.caseNum];
			this.digt = new int[this.caseNum];
			for (int i = 0; i < this.caseNum; i++) {
				String elem[] = this.readLine().split(" ");
				this.A[i] = Integer.parseInt(elem[0]);
				this.B[i] = Integer.parseInt(elem[1]);
				this.digt[i] = elem[0].length()-1;
			}
			this.closeReadFile();
		} catch (Exception e) {
		}
	}

	@Override
	protected void calculate() {
		for (int i=0; i<this.caseNum; i++) {
			int total = 0;
			this.output[i] = CASE + (i+1) + ": ";
			if (this.digt[i] == 0) {
				this.output[i] += total;
				continue;
			}
			int div = 10;
			for (int x=1; x<this.digt[i]; x++) {
				div *= 10;
			}
			for (int j=A[i]; j<B[i]; j++) {
				int value = j;
				for (int x=0; x<this.digt[i]; x++) {
					value = value%div*10+value/div;
					if (value>j && value<=B[i]) {
						total++;
					}else if (value==j) {
						break;
					}
				}
			}
			this.output[i] += total;
		}
	}

	public static void main(String argv[]) {
		if (argv.length > 0) {
			new ProblemC(argv[0]);
		} else {
			new ProblemC("C-small-attempt0.in");
		}
	}

}