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 Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        String result = "AC";
        int count = 0;
        for (int i = 0; i < s.length(); i++) {
            String one = s.substring(i, i + 1);
            if (i == 0) {
                if (!one.equals("A")) {
                    result = "WA";
                    break;
                } else {
                    continue;
                }
            }
            if ((i > 1) && (i < s.length() - 1)) {
                if (one.equals("C")) {
                    count++;
                    continue;
                }
            }
            if (Character.isUpperCase(one.toCharArray()[0])) {
                result = "WA";
                break;
            }
        }
        // 出力
        if (count != 1) {
            result = "WA";
        }
        System.out.println(result);
    }
}