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.Scanner;
public class Main {
	//RockPaperScissors
  public static void main( String[] args ) {
	  Scanner scan = new Scanner(System.in);
	  String S = scan.next();
	  boolean condition = true;
	  if( !(S.substring(0,1).equals("A")) ) {
		  condition = false;
		  //System.out.println("先頭の文字がAではないです。");
	  }
	  int C_cnt = 0;
	  for( int i = 2; i < S.length() - 1; i++ ) {
		  if( S.substring(i,i + 1).equals("C") )C_cnt++;
	  }
	  if( C_cnt != 1 ) {
		  condition = false;
		  //System.out.println("大文字のCの数がちょうど1ではないです。");
	  }
	  for( int i = 1; i < S.length();i++ ) {
		  if( !S.substring(i,i + 1).equals(S.substring(i,i + 1).toLowerCase()) && !(S.substring(i,i + 1).equals("C")) ) {
			  condition = false;
			  //System.out.println("AとCを除く文字列に大文字が混ざっています。 -> " + S.substring(i,i + 1) );
		  }
	  }
	  if( condition ) {
		  System.out.println("AC");
	  }else {
		  System.out.println("WA");
	  }
  }
}