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: Wrong Answer)

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String S = sc.nextLine();
        boolean flg = true;
        int cCount = 0;
        for(int i = 0; i < S.length(); i++) {
            if(i == 0) {
                //一文字目
                if(!(S.charAt(0) == 'A')) {
                    flg = false;
                    break;
                }
            } else if(i >= 2 && i <= S.length()-2) {
                //先頭3文字目 ~ 後ろから2文字目
                if(S.charAt(i) == 'C') {
                    if(cCount != 0) {
                        flg = false;
                        break;
                    } else {
                        cCount += 1;
                    }
                } else {
                    if(Character.isUpperCase(S.charAt(i))) {
                        flg = false;
                        break;
                    }
                }
            } else {
                //それ以外
                if(Character.isUpperCase(S.charAt(i))) {
                    flg = false;
                    break;
                }
            }
        }
        if(flg) {
            System.out.println("AC");
        } else {
            System.out.println("WA");
        }
    }
}