import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);
    try {
      String s = scanner.next();
      String pattern = "^A[a-z]+C[a-z]+$";
      if (s.matches(pattern)) {
        System.out.println("AC");
      } else {
        System.out.println("WA");
      }
    } finally {
      scanner.close();
    }
  }
}

/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