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.



Sample input:
AtCoder


Sample output:
AC

Submission status: Runtime Error

Solution code:
S = input()

if S[0] == 'A' and (S[:3] + S[-2:]).count('C') == 1:
    a = 0
    c = 0
    ng = 0
    for ch in S:
        if ch == 'A':
            a += 1
        elif ch == 'C':
            c += 1
        elif not ch.islower():
            ng += 1
    if a == 1 and c == 1 and ng == 0:
        print("AC")
        sys.exit(0)
print("WA")

Submission status: Runtime Error

Solution code:
A, B = map(int, input().split())
N = int(input())
S = input()

if S[0] == 'A' and (S[:3] + S[-2:]).count('C') == 1:
    a = 0
    c = 0
    ng = 0
    for ch in S:
        if ch == 'A':
            a += 1
        elif ch == 'C':
            c += 1
        elif not ch.islower():
            ng += 1
    if a == 1 and c == 1 and ng == 0:
        print("AC")
        sys.exit(0)
print("WA")