<p>You are given a string <code>sentence</code> that consist of words separated by spaces. Each word consists of lowercase and uppercase letters only.</p>

<p>We would like to convert the sentence to &quot;Goat Latin&quot; (a made-up language similar to Pig Latin.) The rules of Goat Latin are as follows:</p>

<ul>
	<li>If a word begins with a vowel (<code>&#39;a&#39;</code>, <code>&#39;e&#39;</code>, <code>&#39;i&#39;</code>, <code>&#39;o&#39;</code>, or <code>&#39;u&#39;</code>), append <code>&quot;ma&quot;</code> to the end of the word.

	<ul>
		<li>For example, the word <code>&quot;apple&quot;</code> becomes <code>&quot;applema&quot;</code>.</li>
	</ul>
	</li>
	<li>If a word begins with a consonant (i.e., not a vowel), remove the first letter and append it to the end, then add <code>&quot;ma&quot;</code>.
	<ul>
		<li>For example, the word <code>&quot;goat&quot;</code> becomes <code>&quot;oatgma&quot;</code>.</li>
	</ul>
	</li>
	<li>Add one letter <code>&#39;a&#39;</code> to the end of each word per its word index in the sentence, starting with <code>1</code>.
	<ul>
		<li>For example, the first word gets <code>&quot;a&quot;</code> added to the end, the second word gets <code>&quot;aa&quot;</code> added to the end, and so on.</li>
	</ul>
	</li>
</ul>

<p>Return<em> the final sentence representing the conversion from sentence to Goat Latin</em>.</p>

<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>
<pre><strong>Input:</strong> sentence = "I speak Goat Latin"
<strong>Output:</strong> "Imaa peaksmaaa oatGmaaaa atinLmaaaaa"
</pre><p><strong class="example">Example 2:</strong></p>
<pre><strong>Input:</strong> sentence = "The quick brown fox jumped over the lazy dog"
<strong>Output:</strong> "heTmaa uickqmaaa rownbmaaaa oxfmaaaaa umpedjmaaaaaa overmaaaaaaa hetmaaaaaaaa azylmaaaaaaaaa ogdmaaaaaaaaaa"
</pre>
<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>

<ul>
	<li><code>1 &lt;= sentence.length &lt;= 150</code></li>
	<li><code>sentence</code> consists of English letters and spaces.</li>
	<li><code>sentence</code> has no leading or trailing spaces.</li>
	<li>All the words in <code>sentence</code> are separated by a single space.</li>
</ul>

class Solution {
public:
    string toGoatLatin(string sentence) {
        // Turn sentence into vector of words.
        stringstream ss(sentence);
        vector<string> words;
        string tmp;
        while(getline(ss, tmp, ' ')) {
            words.push_back(tmp);
        }

        // Translate each word per rules.
        vector<string> mod_words;
        for (int i = 0; i < words.size(); ++i) {
            const auto w = words[i];
            string suffix = "";
            for (int j = 0; j < i+1; ++j) {
                suffix += "a";
            }

            if (w[0] == 'a' ||
                w[0] == 'e' ||
                w[0] == 'i' ||
                w[0] == 'o' ||
                w[0] == 'u' ||
                w[0] == 'A' ||
                w[0] == 'E' ||
                w[0] == 'I' ||
                w[0] == 'O' ||
                w[0] == 'U'
            ) {
                const auto mod_word = w + "ma" + suffix;
                mod_words.push_back(mod_word);
            }
            else {
                const auto mod_word = w.substr(1) + w[0] + "ma" + suffix;
                mod_words.push_back(mod_word);
            }
        }

        // Turn translated words into output sentence (add spaces).
        string out;
        for (int i = 0; i < mod_words.size(); ++i) {
            out += mod_words[i];
            if (i != mod_words.size()-1) {
                out += " ";
            }
        }

        return out;
    }
};
9000