FOUND RUN TIME ERROR

MY CODE IS GIVING ME PROPER ANSWER ON MY PC BUT AS I UPLOAD IT SOME TIME I GOT COMPILATION ERROR OR RUNTIME ERROR OR SOME TIME WRONG ANSWER PLZ CAN SOME ONE HELP ME.
MY CODE IS

import java.io.DataInputStream;

import java.io.IOException;

public class Main 

{

    public static void main(String[] args) throws IOException
    
    {
    
        DataInputStream in =new DataInputStream(System.in);
        String s;
        char[] str;
        int c=Integer.parseInt(in.readLine());
        while (c>0)
        {
            s=in.readLine();
            str=s.toCharArray();
            int i =0;
            int count=0;
            while(i<str.length)
                {
                    if((str[i]=='A')||(str[i]=='D')||(str[i]=='O')||(str[i]=='P')||(str[i]=='R'))
                        {
                            count=count+1;
                        }
                    else
                    if(str[i]=='B')
                         {
                            count=count+2;
                         }
                    i++;
                  }
            c--;
            System.out.println(count);
        }
      System.exit(0);

    }
}

you forgot the letter “Q”, which adds one hole each time it’s used.

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