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 Kotlin (1.3.71) (judge verdict: Accepted)

fun main(arr:Array<String>) {
    val s = readLine()!!
    println(if(isAc(s)) "AC" else "WA")
}


fun isAc(s:String):Boolean {
    if(s[0] != 'A') {
        return false
    }
    if(s.substring(2 until s.length-1).count { it == 'C' } != 1) {
        return false
    }
    if(s.count { it == 'C' } != 1) {
        return false
    }
    if(s.substring(1).filter { it != 'C' }.all { it in ('a'..'z') }) {
        return true
    }
    return false
}