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Referring to the HTML markup and CSS example below, which element(s) will be targeted?

p:first-of-type:first-letter {
  color: red;
}
<body>
  <p>Paragraph 1.</p>
  <p>Paragraph 2.</p>
  <article>
    <h1>Heading</h1>
    <p>Paragraph 3.</p>
    <p>paragraph 4.</p>
  </article>
  <section>
    <p>Paragraph 5.</p>
    <p>Paragraph 6.</p>
  </section>
</body>