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)


'use strict'

function main(input) {
    input = split("\n")
    input = input[0].split('')

    let ans = "AC"


    //found A
    if (input[0] != "A") {
        ans = "WA"
    }

    let isUpper = (str) => {
        return str.match(/^[A-Z]+$/) ? true : false
    }
    let isLower = (str) => {
        return str.match(/^[a-z]+$/) ? true : false
    }

    let cnt = 0;

    for (let i = 1; i < input.length; i++) {
        if (isUpper(input[i])) {
            if (i == 1 ||
                i == input.length - 1 ||
                input[i] != 'C') {
                ans = "WA";
            }
            ++cnt;
        }
    }
    if (cnt != 1) {
        ans = "WA";
    }

    console.log(ans)
}
main(require('fs').readFileSync('/dev/stdin', 'utf8'))