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 <iostream>
#include <cstring>
using namespace std;
int main(){
    char s[12]; cin >> s;
    bool cptl = false, flag = true;

    if(s[0] != 'A') flag = false;
    else{
        for(int i = 1; i < strlen(s); i++){
            if(s[i] < 'a' || s[i] > 'z'){
                if(cptl){
                    flag = false; break;
                } else if(s[i] != 'C'){
                    flag = false; break;
                } else {
                    if(i == 1 || i == (strlen(s)-1)) break;
                    cptl = true;
                }
            }
        }
    }

    cout << (flag && cptl ? "AC" : "WA") << endl;
    return 0;
}