Scanner enter lowercase letters to uppercase

Import Java.util.Scanner;
/**
* Convert lowercase letters to uppercase letters
* @author zzu119
*
*/
public class Lettertransfer {

public static void Main (string[] args) {
Scanner input = new Scanner (system.in);
System.out.println ("Please enter a lowercase letter (a~z):");
String str = Input.next ();
Char letter = Str.charat (0);//character format converted to alphabetic format
Char letter1 = (char) (LETTER-32);
SYSTEM.OUT.PRINTLN (letter + "uppercase" is: "+ letter1);
}

}

The results of the operation are:

Please enter a lowercase letter (a~z):
A
The upper case of a is: a