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';
// inputに入力データ全体が入る
function Main(input) {
	// 1行目がinput[0], 2行目がinput[1], …に入る
	input = input.split("\n");
    const s = input[0];
    if(s[0] != "A"){
        console.log("WA");
        return 0;
    }
    let numC = 0;
    for(let i = 1; i < s.length; i++){
        if(i >= 2 && i <= s.length - 2 && s[i] == "C"){
            numC++;
            if(numC > 1){
                console.log("WA");
                return 0;
            }
        }else if(s[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"));