import java.util.Scanner;
 
public class Main {
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		String S =in.next();
		int count=0;
		boolean flag=S.matches("A[a-z][a-z,C][a-z,C]*[a-z]");
		for(int i=0;i<S.length();i++) {
			if(S.charAt(i)=='C') {
				count++;
			}
		}
		if(count>=2||count==0) {
			flag=false;
		}
		if(flag) {
			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