<script>
  function eat() {
    var word = document.getElementById('word').value;

    var nth = document.getElementById('nth').value;
    nth = parseInt(nth);

    var p1;
    var p2;

    // pos num
    if (nth > 0) {
      p1 = word.slice(0, nth - 1); 
      p2 = word.slice(nth, word.length) 
    } 
    else if (nth === -1) {
      p1 = word.slice(0, nth);
      p2 = word.slice(nth, word.length - 1);
    }
    // neg num
    else if (nth < 0) {
      p1 = word.slice(0, nth);
      p2 = word.slice(nth + 1, word.length);
    }

    // combine string
    var ans = p1 + p2;

    // if nth's absolute value is bigger than the word's length
    if (nth > word.length || nth < 0 - word.length) {
      ans = "There's nothing there!";
    }
    // 0 nth
    else if (nth === 0) {
      ans = word;
    }

    // print
    document.getElementById('ans').innerHTML = ans;
  }
</script>