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;

class Main{
	public static void main(String[] main) {
		Scanner sc=new Scanner(System.in);
		String a=sc.next();

		boolean isA=false;
		if(a.charAt(0)=='A') {
			isA=true;
		}
		char[] mjs=new char[a.length()];
		for(int i=0; i<a.length(); i++) {
			mjs[i]=a.charAt(i);
		}

		mjs[0]='a';

		int C_cnt=0;
		for(int i=2 ;i<=a.length()-2; i++) {
			if(mjs[i]=='C') {
				C_cnt++;
				mjs[i]='c';
			}
		}

		boolean caps=true;

		for(int i=0; i<a.length(); i++) {
			if((mjs[i]+"").equals((mjs[i]+"").toLowerCase())) {
				//
			}
			else {
				caps=false;
			}
		}

		if(C_cnt==1 && caps==true && isA==true) {
			System.out.println("AC");
		}
		else {
			System.out.println("WA");
		}
	}
}