Frequency of letter in word in JAVA

PROGRAM

import java.util.Scanner;
public class DuplicateLetters{


public static void main(String args[])
{
Scanner scan = new Scanner(System.in);
String letter = scan.next(); // Input from User

String srr[] = letter.split("");
for(int i = 0; i<srr.length;i++){
    int count = 1;
    if(!srr[i].equals("$")){
    for(int j = i+1; j<srr.length;j++){
       
        if(srr[i].equals(srr[j])) {
            srr[j] = "$";
            count++;
        }
    }
    System.out.println(srr[i] +" "+count);
    }
   
}


}

}

Input

BeginnersBook.com

Output

B 2

e 2

g 1

i 1

n 2

r 1

s 1

o 3

k 1

. 1