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>
#include <math.h>
using namespace std;
int main(){
    string S;
    cin >> S;
     int a = 0;
    int  N = S.length();
    if(S[0] != 'A'){
         cout << "WA" << endl;
         return 0;
    }
    else{
        bool frag = 1;
        string  S7 = S.substr(2,N-4);
        if(count(S7.begin(),S7.end(),'C') != 1){
            cout << "WA" << endl;
            return 0;
        }
        
        else{
            bool frag7 = 1;
            for(int i = 0;i < N;i++){
                bool frag = 0;
                if(i != 0 && S[i] != 'C'){
                    for(int j = 0;j < 26;j++){
                        if(S[i] == 'a' + j)frag = 1;
                    }
                }
                if(frag == 0)frag7 = 1;    
            }
            
            if(frag7){
                cout << "AC" << endl;
                return 0;
            }
            else{
                cout << "WA" << endl;
                return 0;
            }
        }
    }
}