var rowIndexS = 0
var rowIndexC = 0

for (let i = 0; i < 50; i++){
  
    $('#tbodyS').append('<tr ><td class="row-index text-center"><p>'+(++rowIndexS).toString()+'</p></td><td class="text-center"></td></tr>');
}

for (let j = 0; j < 50; j++){
  
    $('#tbodyC').append('<tr ><td class="row-index text-center"><p>'+(++rowIndexC).toString()+'</p></td><td class="text-center"></td></tr>');
}