Java Programming

basically, i need to create a program where I input 5 words and then the program outputs the number of unique words and the words themselves. for example, if i input the word hello 5 times, then the output is 1 unique word and the word "hello". i have been agonizing over this dumb problem for days, i know how to do it using hashmap, but this is an introductory course and we cannot use more complex java functions, does ANYONE know how to do this just using arrays, strings, for loops, if clauses, etc. really basic java stuff. i want the code to be able to do what the following program does:

import java.io.*; import java.util.ArrayList; 
    public class MoreUnique { 
       public static void main(String[] args) throws IOException{ BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); String str[] = new String[5]; int uniqueEntries = 0; ArrayList<String> ue = new ArrayList<String>(); 
         for (int i = 0; i < 5; i++) { System.out.print((i +1) + ": "); str[i] = br.readLine(); } 
         for (int j = 0; j < 5; j++) { 
            if (!ue.contains(str[j].toLowerCase())) { ue.add(str[j].toLowerCase()); } } uniqueEntries = ue.size(); System.out.print("Number of unique entries: " + uniqueEntries + " { "); 
         for (int q = 0; q < ue.size(); q++ ) { System.out.print(ue.get(q) + " "); } System.out.println("}"); } } 

but i need to find how to do it so all 5 words are put in at once on one line, and without all the advanced java functions that are in here, can anyone help out?