import java.util.*;
import java.util.ArrayList;
import java.util.Collections;

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        int flag = 1;
        if(s.charAt(0) != 'A'){
            flag = 0;
        }
        int countc = 0;
        for(int i = 2; i <= s.length()-2; i++){
            if(s.charAt(i) == 'C'){
                countc++;
            }
        }
        if(countc != 1){
            flag = 0;
        }
        if(s.charAt(1) <= 'Z' || s.charAt(s.length()-1) <= 'Z'){
            flag = 0;
        }
        if(flag == 1){
            System.out.print("AC");
        } else {
            System.out.print("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