Problem:
Score : 200 points

Problem Statement

You are given a string S. Each character of S is uppercase or lowercase English letter.
Determine if S satisfies all of the following conditions:

The initial character of S is an uppercase A.

There is exactly one occurrence of C between the third character from the beginning and the second to last character (inclusive).

All letters except the A and C mentioned above are lowercase.

Constraints

4 ≤ |S| ≤ 10 (|S| is the length of the string S.)

Each character of S is uppercase or lowercase English letter.

Input

Input is given from Standard Input in the following format:

S

Output

If S satisfies all of the conditions in the problem statement, print AC; otherwise, print WA.

Sample Input 1

AtCoder

Sample Output 1

AC

The first letter is A, the third letter is C and the remaining letters are all lowercase, so all the conditions are satisfied.

Sample Input 2

ACoder

Sample Output 2

WA

The second letter should not be C.

Sample Input 3

AcycliC

Sample Output 3

WA

The last letter should not be C, either.

Sample Input 4

AtCoCo

Sample Output 4

WA

There should not be two or more occurrences of C.

Sample Input 5

Atcoder

Sample Output 5

WA

The number of C should not be zero, either.

Solution in C++14 (GCC 5.4.1) (judge verdict: Accepted)

#include <iostream>
#include <vector>
#include <string>
using namespace std;

typedef long long ll;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

#define Yes cout << "Yes" << endl
#define No cout << "No" << endl
#define REP(i,n) for(int i=0;i<n;i++)
#define pb push_back


// vectorの中身をcout << vs;で表示
template <class T>
ostream &operator<<(ostream &o, const vector<T> &v)
{
    o << "{";
    for (int i = 0; i < (int)v.size(); i++) o << (i > 0 ? ", " : "") << v[i];
    o << "}";
    return o;
}

int main(void) {
	// cin, coutの結びつきを解除し、速くする
	cin.tie(0);
   	ios::sync_with_stdio(false);

	string s; cin >> s;
	int cnt = 0;
	int idx = -1;
	if (s.at(0) != 'A') {
		cout << "WA" << endl;
		return 0;
	} else {
		for (int i = 2; i < s.size() - 1; i++) {
			if (s.at(i) == 'C') {
				cnt += 1;
				idx = i;
			}
		}
		if (cnt != 1) {
			cout << "WA" << endl;
			return 0;
		}
	}

	for (int i = 1; i < s.size(); i++) {
		if (i == idx) continue;
		if (isupper(s.at(i))) {
			cout << "WA" << endl;
			return 0;
		}
	}

	cout << "AC" << endl;


}