import java.util.*;
//https://atcoder.jp/contests/abc104/tasks/abc104_b
import java.util.regex.Pattern;

class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        final String S = sc.next();
        sc.close();
        final String R = "^A[a-z][a-z]*C[a-z]*[a-z]$";
        Pattern p = Pattern.compile(R);

        if (p.matcher(S).find())
            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