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 C++14 (GCC 5.4.1) (judge verdict: Accepted)

#include <bits/stdc++.h>
using namespace std;

int main(void){
  string s;
  cin >> s;
  bool flag1 = false;
  bool flag2 = false;
  bool flag3 = true;
  bool flag4 = true;

  for (int i = 0; i < s.size(); i++) {
    if (i == 0 && s[i] == 'A') {
      flag1 = true;
    }else if (i>=2&&i<=s.size()-2&&s[i] == 'C') {
      if (flag4) {
        flag2 = true;
        flag4 = false;
      }else{
        printf("WA");
        return 0;
      }
    }else{
      if( islower( s[i] ) == 0 ){
        printf("WA");
        return 0;
      }
    }
  }
  if (flag1 == true && flag2 == true && flag3 == true) {
    printf("AC");
  }else{
    printf("WA");
  }
  return 0;
}