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 PyPy3 (7.3.0) (judge verdict: Accepted)

def main():
    s = input()
    flag1, flag2, flag3 = False, False, False
    len_s = len(s)
    cnt2, cnt3 = 0, 0

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

    for i in range(1, len_s):
        if 2 <= i <= len_s - 2 and s[i] == "C":
            cnt2 += 1
        if s[i].islower():
            cnt3 += 1

    if cnt2 == 1:
        flag2 = True

    if cnt3 == len_s - 2:
        flag3 = True

    if flag1 and flag2 and flag3:
        print("AC")
    else:
        print("WA")


if __name__ == "__main__":
    main()