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: Runtime Error)

function main(arg) {
    // 処理
  	if (arg[0] !== 'A') {
        console.log('WA')
        return
    }

    var top = arg.slice(0,2)
    var tmp = arg.slice(2, -1)
    var bot = arg.slice(-1)

    if (!tmp.split("C").length === 2) {
        console.log('WA')
        return
    }

    top = top.spli()
    top[0] = 'a'
    top.join('')

    tmp = tmp.split("C").join("c")

    var text = top + tmp + bot
    for (var i = 0;i < text.length; i++ ){
        if (text[i].search(/[a-z]/) == -1 ){
            console.log('WA')
            return
        }
    }
    console.log('AC')
    return
}
main(require('fs').readFileSync('/dev/stdin', 'utf8'));