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import java.util.Scanner;

public class Main {

public static void main(String[] args) {

String hello = "Hello";

printHashtags("@c4q #rocks #code #tech stuff goes here");

// System.out.println(hello.charAt(7));

// twitterMentions("@c4q #rocks #code #tech stuff goes here");

twitterMentionsArray("@c4q #rocks #code #tech stuff goes here");

}

public static void drawTriangle (int size) {

String triangleString = "";

for (int i = 0; i < size; i++) {

triangleString += "#";

System.out.println(triangleString);

}

}

public static void drawTriangleWithWhile(int size){

String triangleString = "";

int i = 0;

while(i < size) {

triangleString = triangleString + "#";

System.out.println(triangleString);

i++;

}

}

public static void printHashtags(String tweet){

Scanner scanner = new Scanner(tweet);

while(scanner.hasNext()){

String word = scanner.next();

if(word.charAt(0) == '@' || word.charAt(0) =='#'){

System.out.println(word);

}

}

}

public static void twitterMentionsArray(String tweet){

String[] words = tweet.split(" ");

String mentions = "Mentions: ";

String hashtags = "Hashtags:";

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

String word = words[i];

if(word.charAt(0) == '#'){

hashtags += word + " ";

}else if(word.charAt(0) == '@'){

mentions += word + " ";

} else{

continue; //do nothing;

}

}

System.out.println(mentions);

System.out.println(hashtags);

}

public static void twitterMentions(String tweet){

String mentions = "";

String hashtags = "";

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

char c = tweet.charAt(i);

switch (c){

case '@':

while(tweet.charAt(i) != ' ' && i < tweet.length()) {

mentions += tweet.charAt(i);

i++;

}

break;

case '#':

while(c != ' ' && i < tweet.length()){

hashtags += tweet.charAt(i);

i++;

if(tweet.charAt(i) == ' '){

break;

}

}

break;

default: continue;

//fixme any letter thats not @ or #

}

}

System.out.println(mentions);

System.out.println(hashtags);

}

}