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)

function main(input) {
  input=input.trim();
  var arr = input.split("").map((n) => (n));
  var ans = 0

  if(arr[0]=="A"){
    ans++
  }

  var temp=0;
  var memo=0;
  for(var i=2; i<arr.length-1; i++){
    if(arr[i]=="C"){
      temp++;
      memo=i
    }
  }
  if(temp==1){
    ans++
  }

  if(ans==2){
    arr.splice(0,1);
    arr.splice(memo-1,1);
    if(/[A-Z]/.test(arr)==false){
      ans++
    }
    if(ans==3){
      console.log("AC");
    }else{
      console.log("WA");
    }
  }else{
    console.log("WA");
  }
}
main(require('fs').readFileSync('/dev/stdin', 'utf8'));