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 Java7 (OpenJDK 1.7.0) (judge verdict: Wrong Answer)

import java.util.Scanner;

public class Main{
	public static void main(String args[]) {
		Scanner sc = new Scanner(System.in);
		String S;
		int count = 0;
		int tmp = 0;

		S = sc.next();

		if (S.charAt(0) != 'A') {
			System.out.println("WA");
		} else {
			for (int i = 2; i < S.length() - 1; ++i) {
				if (S.charAt(i) == 'C') {
					++count;
					tmp = i;
				}
			}
			if (count != 1) {
				System.out.println("WA");
			} else {
				int i;
				for (i = 1; i < S.length(); ++i) {
					if (i != tmp) {
						if (S.charAt(i) > 'z' && S.charAt(i) < 'a') {
							break;
						}
					}
				}
				if (i == S.length()) {
					if (S.charAt(S.length() - 1) <= 'z' && S.charAt(S.length() - 1) >= 'a') {
						System.out.println("AC");
					} else {
						System.out.println("WA");
					}
				} else
					System.out.println("WA");
			}
		}
		sc.close();
	}
}