import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();

        sc.close();

        String a = s.substring(0, 1);
        String c = s.substring(2, s.length() - 1);
        String rep = s.replaceAll("A", "");
        rep = rep.replaceAll("C", "");

        boolean flg = true;

        if (!a.equals("A")) {
            flg = false;
        }

        int count = 0;
        for (int i = 0; i < c.length(); i++) {
            if (c.charAt(i) == 'C') {
                count++;
            }
        }
        if (count != 1) {
            flg = false;
        }

        String low = rep.toLowerCase();
        if (!rep.equals(low)) {
            flg = false;
        }

        if (flg) {
            System.out.println("AC");
        } else {
            System.out.println("WA");
        }
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz