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 JavaScript (node.js v5.12) (judge verdict: Wrong Answer)

// parameter "input" gets all data
function Main(input) {
  var result = 'AC';

  if (input.charAt(0) != 'A') {
   console.log('WA');
   return;
  }

  var cFound = false;
  for (var i = 1; i < input.length; i++) {
    if (input.charAt(i) === 'C') {
      if (i === 1 || i === input.length - 1 || cFound) {
        console.log('WA');
        return;
      } else {
        cFound = true;
      }
    } else if (input.charAt(i) === input.charAt(i).toUpperCase()) {
     console.log('WA');
     return;
    }
  }

  if (cFound === false) {
    result = 'WA';
  }

  console.log(result);
}
// Don't edit this line!
Main(require("fs").readFileSync("/dev/stdin", "utf8"));