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: Accepted)

moji = input()
moji_split = [moji[i:i+1] for i in range(len(moji))]
moji_middle = []
flag1 = False
flag2 = False
flag3 = False

if moji_split[0] == "A":
    flag1 = True

for i in range(2, len(moji_split)-1):
    moji_middle += moji_split[i]
if moji_middle.count("C") == 1:
    flag2 = True

while "A" in moji_split:
    moji_split.remove("A")
while "C" in moji_split:
    moji_split.remove("C")
if "".join(moji_split).islower() ==True:
    flag3 = True
    
if flag1 == True and flag2 == True and flag3 == True:
    print("AC")
else:
    print("WA")