#include<iostream>
#include<cstring>
using namespace std;
int main()
{
	char s[15];
	while(cin>>s){
		int n=strlen(s),f=1,count=0,k;
		if(s[0]!='A') f=0;
		if(s[1]=='C' || s[n-1]=='C') f=0;
		for(int i=1;i<n;i++)
			if(s[i]<'a'){
				k=i;count++;
			} 
		if(f==1&&count==1&&s[k]=='C') cout<<"AC"<<endl;
		else cout<<"WA"<<endl;
	}	
	return 0;
}