public static String timeConversion(String s) {
    // Write your code here
        StringBuilder finalTime = new StringBuilder("");
        boolean isPm = false;
        for(int i = 0 ; i < s.length() ; i++){
            finalTime.append(s.charAt(i));
            int secoundLastEle  = s.length()-2;
            if(s.charAt(secoundLastEle) == 'A'){
                isPm = false;
            }
            else {
                isPm = true; 
            }
        }
        
        finalTime.deleteCharAt(finalTime.length()-1); // last deletecharAt 
        finalTime.deleteCharAt(finalTime.length()-1); // secound last deletecharAt 
        
            
            String subSet = finalTime.substring(0,2);
            int convert_time = Integer.parseInt(subSet);
            
            if(isPm){
                if(convert_time != 12){
                    convert_time += 12;
                }
                String replace_convert_time = String.valueOf(convert_time);
                finalTime.replace(0,2,replace_convert_time);
            }
            else{
                if(subSet.equals("12")){
                    finalTime.replace(0,2,"00");
                }
            }
        
        return finalTime.toString();
    }