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 (Clang 3.8.0) (judge verdict: Wrong Answer)

// Last Change: 04/03/2019 22:11:05.
#include <algorithm>
#include <array>
#include <bitset>
#include <cmath>
#include <cstdlib>
#include <functional>
#include <iomanip>
#include <iostream>
#include <list>
#include <map>
#include <memory>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <vector>

using namespace std;
using ll = long long;

namespace NS {
void LoopUntilZeroInpput() {
  int hogegegege = 0;
  while (cin >> hogegegege && hogegegege != 0) {
  }
}
} // namespace NS

int main() {
  string S;
  cin >> S;

  bool ans = true;
  int C = 0;
  int sSize = S.size();
  for (int i = 0; i < sSize; ++i) {
    if (i == 0) {
      if (S[i] != 'A') {
        ans = false;
      }
    } else if ((i >= 2 or i <= sSize - 2) and S[i] == 'C') {
      ++C;
    } else {
      if (S[i] >= 'A' and S[i] <= 'Z') {
        ans = false;
      }
    }
  }

  if (C != 1) {
    ans = false;
  }

  if (ans) {
    cout << "AC" << endl;
  } else {
    cout << "WA" << endl;
  }

  //NS::LoopUntilZeroInpput();
}