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)

function Main(input) {
    if (input[0] !== 'A') {
        console.log('WA');
        return;
    }

    var str = input.slice(2, -1);
    var s = str.indexOf('C', 0);
    if (s === -1 && str.split('C').length === 2) {
        console.log('WA');
        return;
    }

    var str1 = input.slice(1, 2);
    var str2 = str.replace('C', '');
    var str3 = input.slice(-1);
    var hoge = str1 + str2 + str3;

    if (hoge.match(/^[a-z]+$/)) {
        console.log('AC');
        return;
    }
    console.log('WA');
}

Main(require("fs").readFileSync("/dev/stdin", "utf8"));