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.next();
    boolean A = false;
    boolean B = true;
    int C = 0;
    for(int i = 0; i < S.length(); i++){
      if(i == 0){
        if(S.charAt(i) == 'A'){
          A = true;
        }
      }else if(i == 1){
        if(S.charAt(i) >= 'A' && S.charAt(i) <= 'Z'){
          B = false;
        }
      }else{
        if(S.charAt(i) == 'C'){
          C++;
        }else{
          if(S.charAt(i) >= 'A' && S.charAt(i) <= 'Z'){
            B = false;
          }
        }
      }
    }
    System.out.println((A && B && C==1) ? "AC" : "WA");
  }
}