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.matches("^A[a-z]+[C]{1}+[a-z]+$")) {
        	System.out.println("AC");
        }else {
        	System.out.println("WA");
        }
	}

} import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
        String S = sc.next();

        if(S.matches("^A[a-z]+[C]{1}+[a-z]+$")) {
        	System.out.println("AC");
        }else {
        	System.out.println("WA");
        }
	}

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

        if(S.matches("^A[a-z]+[C]{1}+[a-z]+$")) {
        	System.out.println("AC");
        }else {
        	System.out.println("WA");
        }
	} main {
		Scanner sc = new Scanner(System.in);
        String S = sc.next();

        if(S.matches("^A[a-z]+[C]{1}+[a-z]+$")) {
        	System.out.println("AC");
        }else {
        	System.out.println("WA");
        }
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String S = sc.next(); S sc.next() sc.next sc if(S.matches("^A[a-z]+[C]{1}+[a-z]+$")) {
        	System.out.println("AC");
        }else {
        	System.out.println("WA");
        } S.matches("^A[a-z]+[C]{1}+[a-z]+$") S.matches S "^A[a-z]+[C]{1}+[a-z]+$" {
        	System.out.println("AC");
        } System.out.println("AC") System.out.println System.out System System.out "AC" {
        	System.out.println("WA");
        } System.out.println("WA") System.out.println System.out System System.out "WA" String[] args args public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
        String S = sc.next();

        if(S.matches("^A[a-z]+[C]{1}+[a-z]+$")) {
        	System.out.println("AC");
        }else {
        	System.out.println("WA");
        }
	}

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

        if(S.matches("^A[a-z]+[C]{1}+[a-z]+$")) {
        	System.out.println("AC");
        }else {
        	System.out.println("WA");
        }
	}

} Main
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.matches("^A[a-z]+[C]{1}+[a-z]+$")) {
        	System.out.println("AC");
        }else {
        	System.out.println("WA");
        }
	}

}
