프로그래머스 - 영어가 싫어요

class Solution {
    public long solution(String numbers) {
        String answer = "";
        String[] ars = numbers.split("");
        String str = "";
        for(int i=0; i<ars.length; i++){
            str += ars[i];
            if(str.equals("zero")){
                answer+="0";
                str = "";
            }
            else if(str.equals("one")){
                answer+="1";
                str = "";
            }
            else if(str.equals("two")){
                answer+="2";
                str = "";
            }
            else if(str.equals("three")){
                answer+="3";
                str = "";
            }
            else if(str.equals("four")){
                answer+="4";
                str = "";
            }
            else if(str.equals("five")){
                answer+="5";
                str = "";
            }
            else if(str.equals("six")){
                answer+="6";
                str = "";
            }
            else if(str.equals("seven")){
                answer+="7";
                str = "";
            }
            else if(str.equals("eight")){
                answer+="8";
                str = "";
            }
            else if(str.equals("nine")){
                answer+="9";
                str = "";
            }

            
        }
        return Long.parseLong(answer);
    }
}