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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
  <input class="the-input" type="text" placeholder="input a-z">
  <script>
    document.querySelector('.the-input').onkeyup = e => e.target.value = e.target.value.replace(/[^a-z]/g,'');
  </script>
</body>
</html>
Output

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anonymouspro
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