import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        if (s.charAt(0) != 'A') {
            System.out.println("WA");
            return;
        }
        String sub = s.substring(2, s.length()-1);
        int count = 0;
        for (int i = 0; i < sub.length(); i++) {
            if (sub.charAt(i) == 'C') count++;
        }
        if (count != 1) {
            System.out.println("WA");
            return;
        }

        int lcount = 0;
        for (int i = 0; i < s.length(); i++) {
            if (String.valueOf(s.charAt(i)).matches("[A-Z]")) lcount++;
        }
        if (lcount != 2) {
            System.out.println("WA");
        } else {
            System.out.println("AC");
        }
    }
}
/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