<head></head>
<body>
<script>
let temperStr = prompt("Enter please temperature with F or C ");
temperVal = temperStr.substring(0, temperStr.length - 1);
if (temperStr.charAt(temperStr.length - 1) == 'F') {
let temperCels = (temperVal - 32.0) * 5.0 / 9.0;
alert("Temperature in Celsius: " + temperCels.toFixed(1) + "C");
}
else {
let temperFahr = (temperVal * 9.0 / 5.0) + 32.0;
alert("Temperature in Fahrengeit: " + temperFahr.toFixed(1) + "F");
}
</script>
</body>