题解 | 大小写转换

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        while(scanner.hasNextLine()){
            String a = scanner.nextLine();

            char aa = a.charAt(0);

            if (Character.isUpperCase(aa)){
                char aaa = (char) (aa + 32);
                System.out.println(aaa);
            }

        }
    }
}