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 Scala (2.11.7) (judge verdict: Accepted)

object Main extends App {
	val s = scala.io.StdIn.readLine.toList.toArray
	val size = s.size
 
	val A = Array('B', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z')

	if(s(0) == 'A'){
		var flag = false
		var cnt  = 0

		if(A.contains(s(1))) flag = true
		if(A.contains(s(size-1))) flag = true

		for(i<-2 to size-2){
			if(s(i) == 'C') cnt += 1
			if(A.contains(s(i))) flag = true
		}

		if(flag) println("WA")
		else if(cnt == 1) println("AC")
		else println("WA")
	}else{
		println("WA")
	}
}