public class WordsReverse {

    public static void main(String[] args) {
        String test = "big brown fox jumped over   a lazy dog";
        StringBuilder result = new StringBuilder();
        int start = 0;
        for(int end = 0; end < test.length(); end++) {
            if(test.charAt(end) == ' ') {
                for(int i = end-1; i >= start; i--) {
                    result.append(test.charAt(i));
                }
                result.append(" ");
                start = end+1;
            }
        }

        System.out.println(result.toString());

    }
}