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 <iostream>
#include <string>

using namespace std;

int main(){
    string S; cin >> S;
    bool f=true;
    if(S[0] != 'A'){
        cerr << "111 ";
        f=false;
    }
    if(S[1] == 'C'){
        cerr << "222 " ;
        f=false;
    }
    if(S[S.length()]=='C'){
        cerr << "333 ";
        f=false;
    }
    int c=0;
    for(int i=2;i<S.length()-1;i++){
        cerr << S[i] << " ";
        
        if(S[i] == 'C'){
             c++;
        //}else if(S[i]<'a' || S[i]>'z'){
        }else if(isupper(S[i])){
            cerr << "aaa " ;
            f=false;
        }
    }
    cerr << c << " " << f << endl;
    if(f){
        if(c==1){
            cout << "AC" << endl;
        }else{
            cout << "WA" << endl;
        }
    }else{
        cout << "WA" << endl;
    }
    return 0;
}