import java.util.*;
public class Main{
	public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        int cnt = 0;
        for(int i =0; i<s.length(); i++){
            if(Character.isUpperCase(s.charAt(i))){
                cnt++;
            }
        }
        if(s.charAt(0)=='A'){
            for(int i =2; i<=s.length()-2;i++){
                if(s.charAt(i)=='C'){
                    if(cnt==2){
                        System.out.println("AC");
                        return;
                    }
                }    
            }
        }
        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