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)

# R = int(input())
# a, b = map(int, input().split())
# c = list(map(int, input().split()))
# d = [list(map(int, input().split())) for _ in range(n)]
s = input()

ans = "AC"

if s[0] != "A":
    ans = "WA"

count = 0

for i in range(len(s)):
    if i == 0:
        continue
    if i >= 2 and i != len(s)-1:
        if s[i] == "C":
            count += 1
        else:
            if s[i].isupper():
                ans = "WA"
    else:
        if s[i].isupper():
            ans = "WA"

if count != 1:
    ans = "WA"

print(ans)