I need the DASH it needs to display "356-9377"

here is my code please explain the fix.

import java.util.*;

public class Telephone {

public static void main(String[] args) {

String sevenChar = "flowers"; //356-9377

System.out.println(Convert(sevenChar));

}

public static String Convert(String word){

//HashMap mapper = new HashMap();

//char[] charWord = word.toCharArray();

String temp = "";

for(int i = 0; i < word.length(); i++){

switch(word.charAt(i)){

case 'a':

case 'b':

case 'c':

temp += '2';

break;

case 'd':

case 'e':

case 'f':

temp += '3';

break;

case 'g':

case 'h':

case 'i':

temp += '4';

break;

case 'j':

case 'k':

case 'l':

temp += '5';

break;

case 'm':

case 'n':

case 'o':

temp += '6';

break;

case 'p':

case 'q':

case 'r':

case 's':

temp += '7';

break;

case 't':

case 'u':

case 'v':

temp += '8';

break;

case 'w':

case 'x':

case 'y':

case 'z':

temp += '9';

break;

}

}

String dash = "-";

String newString = "";

for(int i = 0; i < temp.length(); i++){

newString += temp.charAt(i);

if(temp.charAt(i) == 3){

newString += dash;

}

}

return newString;

}

}