基础练习 FJ的字符串

import java.util.Scanner;  
      
    public class Main{   
        public static void main(String[] args) {
            Scanner input = new Scanner(System.in);
            int n;
            n = input.nextInt();
            String a = "A";
            for(int i=1;i<n;i++){
                int b = ‘A‘+i;
                a = a + (char)b + a;
            }
            System.out.println(a);
        }
    
 }