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 Python (3.4.3) (judge verdict: Wrong Answer)

# -*- coding: utf-8 -*-
import logging
import time


class Solver:
    def __init__(self):
        self.s = ''

    # 入力
    def input_value(self):
        # self.n = int(input())
        # self.A, self.B = map(int, input().split())
        # self.A = list(map(int, input().split()))
        # self.a, self.b, self.c = map(int, [input() for i in range(4)])
        # self.t = [None] * self.n
        self.s = input()

    @staticmethod
    def run(s):
        if s[0] == 'A':
            s_b = s[2:-1]
            s_c = s[-1:]
            if s_b.count('C') == 1:
                s_b = s_b.strip('C')
            else:
                return 'WA'
            if (s_b + s_c).islower():
                return 'AC'
        return 'WA'

    @staticmethod
    def test():
        start_time = time.time()

        assert Solver.run('AtCoder') == 'AC', 'Error.'
        assert Solver.run('ACoder') == 'WA', 'Error.'
        assert Solver.run('AcycliC') == 'WA', 'Error.'
        assert Solver.run('AtCoCo') == 'WA', 'Error.'
        assert Solver.run('Atcoder') == 'WA', 'Error.'

        elapsed_time = time.time() - start_time
        logging.debug('elapsed_time: {0}'.format(elapsed_time) + '[sec]')


if __name__ == '__main__':
    logging.basicConfig(level=logging.DEBUG)

    solver = Solver()

    # Solver.test()

    solver.input_value()
    ans = solver.run(solver.s)
    # print(str(ans))
    print(ans)