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 (Clang 3.8.0) (judge verdict: Accepted)

#include <iostream>
#include <string>

using namespace std;
typedef long long ll;

int main(){
    string s;
    getline(cin, s);
    if(s.at(0) != 'A'){
        cout << "WA" << endl;
        return 0;
    }

    int large_c = 0;
    for(int i = 2; i <= s.size() - 2; ++i){
        large_c += (s.at(i) == 'C');
    }
    if(large_c != 1){
        cout << "WA" << endl;
        return 0;
    }

    for(int i = 1; i < s.size(); ++i){
        char c = s.at(i);
        if(c != 'C' && !((c >= 97 && c <= 122))){
            cout << "WA" << endl;
            return 0;
        }
    }

    cout << "AC" << endl;

    return 0;
}