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;
import java.util.Arrays;
import java.util.Comparator;
import java.util.Map;
import java.util.HashMap;
import static java.lang.Math.*;

public class Main
{
    String s;
    
    public static void main(String args[])
    {
	new Main().solve();
    }
    
    void solve()
    {
	in();

	out();
    }

    void in()
    {
	Scanner sc = new Scanner(System.in);
	s = sc.next();
    }

    void out()
    {
	int cnt = 0;
	for(int i = 0; i < s.length(); i++) {
	    char c = s.charAt(i);
	    if(c < 'A' || 'Z' < c) cnt++;
	}

	int sl = s.length();
	
	if(s.charAt(0) == 'A' && s.substring(2, sl - 1).indexOf("C") != -1 && sl == cnt + 2)
	    out("AC");
	else
	    out("WA");
	
    }
    
    void out(int n)
    {
	System.out.println(n);
    }

    void out(double n)
    {
	System.out.println(n);
    }

    void out(long n)
    {
	System.out.println(n);
    }
    
    void out(char c)
    {
	System.out.print(c);
    }
    
    void out(String s)
    {
	System.out.println(s);
    }
}