import java.util.*;

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

    String str = sc.next();
    boolean flag = true;

    if (!(String.valueOf(str.charAt(0)).equals("A"))) {
      flag = false;
    } else if (Character.isUpperCase(str.charAt(1)) || Character.isUpperCase(str.charAt(str.length()-1))) {
      flag = false;
    } else {
      int count = 0;

      for (int i = 2; i < str.length()-1; i++) {
        if (String.valueOf(str.charAt(i)).equals("C")) {
          count++;
        } else if (Character.isUpperCase(str.charAt(i))) {
          flag = false;
        }
      }

      if (count != 1) {
        flag = false;
      }
    }

    if (flag == true) {
      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