アハティムチャイチャレンジ
1791.大文字小文字変換(難しい)
import java.util.Scanner;
/**
* @author yinglongwu
*/
//1791. 大小写转换(难)
public class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
String s = scanner.next();
int n = scanner.nextInt();
switch (n) {
case 1:
System.out.println(s.toLowerCase());
break;
case 2:
System.out.println(s.toUpperCase());
break;
case 3:
s = s.substring(0, 1).toUpperCase()+s.substring(1).toLowerCase();
System.out.println(s);
break;
default:
break;
}
}
}