题解 | #大小写转换#

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        try(Scanner in = new Scanner(System.in)) {
            while (in.hasNext()) {
                char x = in.next().charAt(0);
                char lower = (char)(x + 32);
                System.out.println(lower);
            }
        }
    }
}