how to get the id of droppable item using sortable

How can I get the id of the item where a dragged item is to be dropped instead, using sortable. I can get the ID of the dragged item but can't get the ID of the item to be dropped instead. Here is my code for what have I tried so far:

$(function () {
    //to prevent items from moving around when draging
    containment: "parent",
    start: function (event, ui) {
        // get the initial position(index) of item
        var start_pos = ui.item.attr('id');'start_pos', start_pos);


    update: function (event, ui) {
        var index = ui.item.index();//position of dropped
        var start_pos = ui.item.attr('id');//position of dragged

        // Iterate over all <li> elements
        $.each($('#sortable li'), function (idx, item) {

           // $(item).html(html + ' - ' + (idx + 1));
    axis: 'y'

for example, if I'm dragging the item from position 1 to position 5 I want to alert 1 and 5


Try the below code :-)

$('.selector').droppable({ drop: Drop });

function Drop(event, ui) {
  var draggableId = ui.draggable.attr("id");
  var droppableId = $(this).attr("id");

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