JAVA 仿射编码方案处理密文得到明文

    package practice1;
    
    import java.util.Scanner;
    
    
    public class Hello {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        String str1 = input.nextLine();
    
        int[] count = new int[26];
        for(int i = 0;i <str1.length();i++){
            char tmp = str1.charAt(i);
            if(tmp >= 65 && tmp <= 90){
                int index = tmp - 65;
                count[index]++;
            }
        }
        for(int i = 0;i < count.length;i++){
            if(count[i] != 0)
                Sy