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 Perl (v5.18.2) (judge verdict: Accepted)

$s=<>;
chomp($s);
@D = ($s=~/\D/g);
$len = @D;
$flg = 0;
if($D[0] eq "A"){
	$flg = 1;
}
if(!($D[1] =~ /[a-z]/) or !($D[$#D] =~ /[a-z]/)){
	$flg = 0;
}
for($i=2;$i<$len-1;$i++){
	if($D[$i] =~ /[a-z]/){
    }elsif($D[$i] eq "C"){
    	$ccnt++;
    }
}

if($flg == 1 && $ccnt == 1){
	print "AC";
}else {
	print "WA";
}