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 Pascal (FPC 2.6.2) (judge verdict: Accepted)

var s:string;
n,i:longint;
f:boolean;
begin 
	readln(s);
	n:=length(s);
	if s[1]<>'A' then begin write('WA');exit;end;
	if  (s[2]<'a') or  (s[n]<'a')  then begin write('WA');exit;end;
	f:=true;
	for i:=3 to n-1 do 
	if (s[i]='C') and (f=false) or (s[i]<'a') and (s[i]<>'C') then begin write('WA');exit;end
	else if s[i]='C' then f:=false;
	if f=true then begin write('WA');exit;end;
	write('AC');
end.