function lettersLoop(from, to, callback)
{
var i = from.charCodeAt(0);
var to = to.charCodeAt(0);
for(;i<=to;i++) callback(String.fromCharCode(i));
}
var sequence = "";
lettersLoop("A", "Z", function(char) {
sequence += char + " ";
});
document.body.innerHTML = sequence;
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