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>
#define rep(i,n) for (int i=0; i<=(n); i++)
typedef long long ll;
using namespace std;
 
int main(){
    string S; cin >> S;
    bool bool1=0;
    bool bool2=0;
    int cnt=0;
    if (S[0]=='A'){ 
        bool1=1;
        cnt++;
    }
    for (int i=2; i<S.size()-3;i++){
        if(S[i]=='C'){
            bool2=1;
            cnt++;
        }
    }
    
    for (int i=S.size()-4; i<S.size(); i++){
        if(S[i]=='C'){
            cnt++;
        }
    }
    
    if(bool1==1&&bool2==1&&cnt==2){
        cout << "AC";
    }else{
        cout << "WA";
    }
}