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: Runtime Error)

"""
B - AcCepted
文字列 S が与えられます。S のそれぞれの文字は英大文字または英小文字です。 S
が次の条件すべてを満たすか判定してください。

S の先頭の文字は大文字の A である。
Sの先頭から 3 文字目と末尾から 2 文字目の間（両端含む）に大文字の C がちょうど 1
個含まれる。
以上の A, C を除く S のすべての文字は小文字である。
"""

s = input()

ans = True
if s[0] != "A":
    ans = False
    print("s[0] is not A")
else:
    cnt_C = 0
    for n in range(1, len(s)):
        check_char = s[n]
        
        if check_char.islower():
            pass
        else:
            if check_char == "C" and 2 <= n and n < len(s) - 1:
                cnt_C += 1
            else:
                ans = False
                break

if cnt_C != 1:
    ans = False

if ans:
    print("AC")
else:
    print("WA")