#include <iostream>
using namespace std;
int main(){
  string s; cin >> s;
  bool ok = 1;
  if(s[0] != 'A') ok = 0;
  int res = 0;
  for(int i=2;i<=s.size()-2;i++){
    if(s[i]=='C') res++;
  }
  if(res!=1) ok = 0;
  int m = 0;
  for(int i=0;i<s.size();i++){
    if('A'<=s[i] && s[i] <= 'Z') m++;
  }
  if(m!=2) ok = 0;
  if(ok) cout << "AC";
  else cout << "WA";
}