import java.util.Scanner;
import java.io.*;
import java.lang.Math;


public class C{
	public static int recycle(String str){
		String[] numbers = str.split(" ");
		int min = Integer.parseInt(numbers[0]);
		int max = Integer.parseInt(numbers[1]);
		int ret = 0;

		for(int i = min; i < max; i++){
			String num = i + "";
			int len = num.length();
			int k = i;
			for(int j = 1; j < len; j++){
				k = (k/10) + (int)java.lang.Math.pow(10.0,(double)(len-1))*(k%10);
				if (k > i && k <= max)
					ret++;
				else if(k == i)
					break;
			}
		}

		return ret;
	}

	public static void main(String[] args){
		Scanner sc = null;
		String next;
		int out;
		try{
			sc = new Scanner(new File("C-large.in"));
			int cases = Integer.parseInt(sc.nextLine());
			int current = 0;
			

			FileWriter fs = new FileWriter("output.txt");
			BufferedWriter buff = new BufferedWriter(fs);
			while(current < cases){
				next = sc.nextLine();
				current++;
				out = recycle(next);
				buff.write("Case #" + current + ": " + out + "\n");
			}
			buff.close();
		}
		catch(Exception ex){}
	}
}
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.StringTokenizer;
class process implements Runnable {
	Thread t;
	long a=0,b=0;
	long res=0;
	int len,c=0;
	String str="";
	process(int i,long a1,long a2) {
		c=(i+1);
		a=a1;
		b=a2;
		len=String.valueOf(a).length();
		t = new Thread(this);
		t.run();
	}

	public void run() {
		
		for(long i=a;i<=b;++i)
		{
			long temp1=i;
			int temp2=0;
			int temp_len=0;
			for(int j=1;j<len;++j)
			{
					temp2=(int) (temp1%10);
					temp1=temp1/10;
					temp1=(long) ((temp2*Math.pow(10, len-1))+temp1);
					temp_len=String.valueOf(temp1).length();
					if(temp1>i && temp1<=b && (temp_len==len))//if(temp1>i && temp1<=b)
					{	
						res++;
						//System.out.println(i+"\t"+temp1);
					}
					if(temp1==i)
						break;
				
			}
		}
		
	}
	public void print()
	{
		System.out.println("Case #"+c+": "+res);
		
	}

}

public class Main {
	public static void main(String[] args) throws Exception {
		StringTokenizer st;
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int t=Integer.parseInt(br.readLine());
		process[] pr=new process[t];
		for(int i=0;i<t;++i)
		{
			st=new StringTokenizer(br.readLine());	
			pr[i]=new process(i,Long.parseLong(st.nextToken()),Long.parseLong(st.nextToken()));
		}

		for(int i=0;i<t;++i)
		{
			pr[i].t.join();
			pr[i].print();
		}
		
		
	}
}
