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 (3.8.2) (judge verdict: Accepted)

s = input()
ans = True

if s[0] != 'A':
    ans = False
    # print(f's[0]:{s[0]}')

index = -1
between_bigin_3_and_end_2 = s[2:-1]
count = between_bigin_3_and_end_2.count('C')
if count == 1:
    index = s.index('C')
    # print(index)
else:
    ans = False
    # print(f'between_bigin_3_and_end_2:{between_bigin_3_and_end_2}')
    # print(f'count:{count}')

    
for i in range(len(s)):
    if i == 0:
        continue
    if i == index:
        continue
    if not s[i].islower():
        ans = False


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