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)

S = input()
n = len(S)
p = 0
if S[0] == 'A':
    p = 1
s = []
for i in range(2,n-1):
    s.append(S[i])
q = 0
if s.count('C') == 1:
    q = 1
s.remove('C')
s.append(S[1])
s.append(S[n-1])
r = 1
for i in range(n-2):
    x = s[i]
    t = ord(x)-97
    if 0<= t <= 25:
        continue
    else:
        r = 0
        break
ans = 'WA'
if p*q*r == 1:
    ans = 'AC'
print(ans)