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: Wrong Answer)

#include<bits/stdc++.h>
using namespace std;
int main(){
    string str;
    cin >> str;
    int C = 0, N = 0, size;
    size = (int)str.size();
    if(str[0] != 'A'){
        cout << "WA\n";
    }else{
        for(int i=2;i<size - 2;i++){
            if(str[i] == 'C'){
                C++;
            }else if(isupper(str[i])){
                N++;
            }
        }
        if(isupper(str[1])) N++;
        if(isupper(str[size-2])) N++;
        if(isupper(str[size-1])) N++;
        if(C == 1 && N == 0) cout << "AC\n";
        else cout << "WA\n";
    }
    
    return 0;
}