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: Wrong Answer)

const main = function(input){
  var str = input;
  var len = str.length;
  var ac = false;
  var CAppeared = false;
  
  if(str[0]!=="A"){
  	console.log("WA");
    return;
  }  
  for(var i=1;i<len;i++){
    if(isUpper(str[i])){
      	if(i===1) break;
        else if(i===len-1) break;
	    if(CAppeared)break;
        else if(str[i]==="C") CAppeared = true;
    }
    if(i===len-1 && CAppeared) ac=true;
  }
  if(ac) console.log("AC");
  else console.log("WA");
}

const isUpper = function (str){
  return str===str.toUpperCase();
}
 
 
main(require("fs").readFileSync("/dev/stdin","utf-8"));