import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashSet;

public class Recycled {
    public static void main(String[] args) {
        try {
            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
            int t = Integer.parseInt(br.readLine());
            for (int i = 0; i < t; i++) {
                String[] str = br.readLine().split(" ");
                int a = Integer.parseInt(str[0]);
                int b = Integer.parseInt(str[1]);
                System.out.println("Case #" + (i + 1) + ": " + find(a, b));
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private static int find(int a, int b) {
        HashSet<Long> used = new HashSet<Long>();
        int digits = String.valueOf(a).length();
        if (digits == 1) return 0;
        for (int i = a; i <= b; i++) {
            int s = 10;
            int m = (int) Math.pow(10, digits-1);
            for (int j = 0; j < digits-1; j++) {
                int r = i % s;
                if (r < s/10) continue;
                int q = i / s;
                int rn = r * m + q;
                s *= 10; m /= 10;
                if (i != rn && rn >= a && rn <= b) {
                    long pp;
                    if (rn < i) pp = (long)rn << 30 | i;
                    else pp = (long)i << 30 | rn;
                    if (!used.contains(pp)) {
                        used.add(pp);
                    }
                }
            }
        }
        return used.size();
    }
}

import java.util.Scanner;


public class Recycled {
	/*
	private static boolean areTwoMirrors(int n, int m, int A, int B) {
		if (A > n || n >= m || m > B) return false;
		
		String mStr = Integer.toString(m);
		String nStr = Integer.toString(n);
		if (mStr.charAt(0) == '0' || nStr.charAt(0)=='0') return false;
		if (mStr.length() != nStr.length()) return false;
		for (int i=1; i < nStr.length(); i++) {
			nStr = nStr.substring(1) + nStr.charAt(0);
			if (nStr.equals(mStr)) return true;
		}
		return false;
	}*/
	static int[] powersOfTen = new int[7];
	private static int process(int A, int B) {
		//boolean[] hasVisited = new boolean[B+1];
		int numDigits = Integer.toString(A).length();
		int count = 0;
		for (int i = A; i < B; i++) {
			int num = i;
			for (int start = 1; start < numDigits; start++) {
				int firstDigit = num/powersOfTen[numDigits-1];
				num -= firstDigit*powersOfTen[numDigits-1];
				num *= 10;
				num += firstDigit;
				if (num <= B && num > i) {
					//if (!areTwoMirrors(i,num,A,B)) System.out.println("Jlfwje");
					//System.out.println(i+" "+num);
					count++;
				}
			}
		}
		return count;
	}
	public static void main(String[] args) {
		int currPower = 1;
		for (int i=0; i < powersOfTen.length; i++) {
			powersOfTen[i] = currPower;
			currPower *= 10;
		}
		Scanner in = new Scanner(System.in);
		int T = in.nextInt();
		for (int i=0; i < T; i++) {
			int A = in.nextInt();
			int B = in.nextInt();
			System.out.println("Case #"+(i+1)+": "+process(A,B));
		}
		
		//System.out.println(process(A,B));
	}
}
