public class AA {
public static void main(String[] args) {
OK:
while (true) {
System.out.println("输入一串大写字母");
Scanner sc = new Scanner(System.in);
String str = sc.next();
char[] chars = str.toCharArray();
int l = chars.length;
long sum = 0;
for (int i = 0; i < chars.length; i++, l--) {
if (chars[i]<65 || chars[i]>90){
System.out.println("输入的不是纯大写字母");
System.out.println("================================");
continue OK;
}
int x = 1;
for (int j = 0; j < l-1; j++) {
x = 26 * x;
}
long count = (chars[i] - 64) * x;
sum += count;