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 Java7 (OpenJDK 1.7.0) (judge verdict: Accepted)

import java.util.*;

public class Main{

	public static void main(String args[]){
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		sc.close();
		String ans[] = {"AC", "WA"};
		int an = 0;
		int n = s.length();
		int count = 0;
		if(s.charAt(0) != 'A')an = 1;
		for(int i = 1; i < n; ++i){
			if(Character.isUpperCase(s.charAt(i))){
				if(i == 1 || i == n - 1){
					an = 1;
					break;
				}
				else{
					if(s.charAt(i) == 'C'){
						if(count >= 1){
							an = 1;
							break;
						}
						count++;
					}
				}	
			}
		}
		if(count == 0)an = 1;
		System.out.println(ans[an]);
	}
}