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;

public class Main
{

	public static void main(String[] args)
	{	Scanner s = new Scanner(System.in);
                String r = s.next();
                int n = r.length();
                int i=0,j=0,k=0,z=0,t=0;
                for(i=0;i<n;i++){

                  int l = r.charAt(i);
                     if(r.charAt(0)=='A'){
                        j=1;
                     }
                     if((i>=2 && i<n-1) && r.charAt(i)=='C'){
                        k=1;
                        t++;
                     }
                     if(l==65 || l==67 || (l>=97 && l<=122)){
                        z=1;
                     }else{
                        z=0;
                        break;
                     }
                     

                }
                if(j==1 && k==1 && z==1 && t==1){
                  System.out.println("AC");
                }else{
                  System.out.println("WA");
                }
                
	}
}