Search for equal numbers or alphanumeric values inserted in input elements

I want to loop through all the input elements and find if the same value exists.

For example when a user inserts 1(one) and then inserts again the number 1(one), I would like to apply CSS to change the background color of the input element for these 2 equal values or no matter how many they may be.

If the user tries to insert an alphanumerical value then JavaScript handles the code and adds the selected-wrong-input CSS class.

I would like on that element to have a setInterval for 2 seconds and take out the alphanumerical value from the input in order for the user to be able to insert a number again.

I don't mind if the proposed solution is with JavaScript, jQuery or a combination of both.

The html code:

<div class="bus-builder-seat-box-container" id="dynamic-bus-builder-1">       
  <input id="posA100" type="text" class="input seat_box" onchange="bc.seatBoxHandleEvent(this)">
  <input id="posA101" type="text" class="input seat_box" onchange="bc.seatBoxHandleEvent(this)">
  <input id="posA102" type="text" class="input seat_box" onchange="bc.seatBoxHandleEvent(this)">
  <input id="posA103" type="text" class="input seat_box" onchange="bc.seatBoxHandleEvent(this)">
  <input id="posA104" type="text" class="input seat_box selected" onchange="bc.seatBoxHandleEvent(this)">
  <input id="posA105" type="text" class="input seat_box selected" onchange="bc.seatBoxHandleEvent(this)">
  <input id="posA106" type="text" class="input seat_box selected" onchange="bc.seatBoxHandleEvent(this)">
  <input id="posA107" type="text" class="input seat_box selected-wrong-input" onchange="bc.seatBoxHandleEvent(this)">
</div>

The JavaScript code. The first is the event which is called in the html input element onchange

bc.seatBoxHandleEvent = function (el) {
  bc.checkInput(el);

  var seatNumberFirstFloor = $('#dynamic-bus-builder-1');

  if (seatNumberFirstFloor && seatNumberFirstFloor.valueOf()) {
    var leftStreaming = (event.target.id);
    var rightStreaming = 'posB1' + leftStreaming.substring(5, 7);
    document.getElementById(rightStreaming).innerHTML = event.target.value;
  }
}

bc.checkInput = function (el) {

  let $el = $(el); 

  var targetValue = event.target.value;
  var id = event.target.id;
  var classOfInput = event.target.classList;

  if (targetValue !== 8 && targetValue !== 0 && (targetValue < 48 || targetValue > 57)) {
    console.log('valid number');
    console.log(classOfInput);
    $(el).toggleClass('selected');

  }
  else {
    console.log('invalid character');
    $(el).toggleClass('selected-wrong-input');
    //console.log(el.value);
  }

  var array = new Array(120);
  var existsValue = false;

  for(var i = 0; i <= array.length; i++) {
    console.log(el.value);
    console.log(i);
    if (el.value === array[i]) {
        console.log('hi');
        console.log(el.value);
        console.log(array[i]);

        var existsValue = true;
        console.log('existsValue');
        console.log('equal number forbidden');
        //break;
    }
  }