import java.util.*;
public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
		String s = sc.next();
		if (s.charAt(0)!='A') {
			System.out.println("WA");
			return;
		}
		int count =0;
		for (int i=2;i<s.length()-1;i++) {
			if (s.charAt(i)=='C') {
				count ++;
			}
		}
		if (count!=1) {
			System.out.println("WA");
			return ;
		}
		for (int i=1;i<s.length();i++) {
			if (s.charAt(i)!='C'&&(s.charAt(i)<'a'||s.charAt(i)>'z')) {
				System.out.println("WA");
				return ;
			}
			if (s.charAt(i)=='C') {
				if (i==1||i==s.length()-1) {
					System.out.println("WA");
					return ;
				}
			}
		}
		System.out.println("AC");
		return ;
	}
}
/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