<html>
<body>
<span id="letter-0">П</span>
<span id="letter-1">р</span>
<span id="letter-2">и</span>
<span id="letter-3">в</span>
<span id="letter-4">е</span>
<span id="letter-5">т</span>
</body>
</html>for (var i = 0; i < 6; i++) {
var id = 'letter-' + i;
console.log(id);
let el = document.getElementById(id);
console.log(el);
}
