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: Accepted)

'use strict';
function main(arg) {
    // 処理
    arg = arg.split("\n")
    arg = arg[0]
  	if (arg[0] !== "A") {
        console.log('WA')
        return
    }


    var numC = 0
    for(var i = 1; i < arg.length; i++){
        if(i >= 2 && i <= arg.length - 2 && arg[i] == "C"){
            numC++;
            if(numC > 1){
                console.log("WA");
                return 0;
            }
        }else if(arg[i].search(/[a-z]/) == -1){
            console.log("WA");
            return 0;
        }
    }
  	if(numC != 1){
        console.log("WA")
    } else {
        console.log('AC')
    }
}
main(require('fs').readFileSync('/dev/stdin', 'utf8'));