import java.util.*;

public class Main {

  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String s = sc.next();
    char[] c = new char[s.length()];
    int count1 = 0;
    int count2 = 0;

    for (int i = 0; i < s.length(); i++) {
      c[i] = s.charAt(i);
    }

    if (c[0] != 'A') {
      System.out.println("WA");
      return;
    }

    for (int i = 2; i < c.length-1; i++) {
      if (c[i] == 'C') {
        count1++;
      }
    }

    for (int i = 0; i < c.length; i++) {
      if (c[i] >= 'A' && c[i] <= 'Z'){
        count2++;
      }
    }


    if (count1 == 1 && count2 == 2) {
      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