#include<bits/stdc++.h>
using namespace std;

int main() {
	int a,b,n,T,cas=0;
	string str;
	cin>>str;
	if(str[0] != 'A') return cout<<"WA", 0;
	int cnt=0;
	for(int i=2;i<str.size()-1;++i) {
		if(str[i]=='C') cnt++;
	}
	if(cnt!=1) return cout<<"WA", 0;
	for(int i=1;i<str.size();++i) {
		if(str[i]=='C') continue;
		if(isupper(str[i])) return cout<<"WA", 0;
	}
	return cout<<"AC", 0;
}