package com.gmail.sergiopartner;

import java.util.Arrays;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		System.out.println("Input text " + '"' + "Big boss love big beef hamburger" + '"');

		String a = sc.nextLine();
		char[] b = a.toCharArray();

		int n = 0;
		for (int i = 0; i < b.length; i += 1) {
			if (b[i] == 'b' || b[i] == 'B') {
				n += 1;
			}

		}

		System.out.println("This sentence has " + n + " letters " + '"' + "b" + '"');

	}

}