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: Accepted)

#include <iostream>
//#include <set>
//#include <map>
//#include <iomanip>
//#include <algorithm>
//#include <numeric>
//#include <queue>
//#include <stack>
//#include <math.h>
//#include <vector>
#include <string>
//#include <list>
//#include <deque>
//#include <unordered_map>
//typedef long long LL;
//typedef long double LD;
using namespace std;
 
//#define MOD 1000000007
//#define MAX 200100
//#define NIL -1

int main() {
    string s;
    bool ans=true;
    cin >> s;
    if(s[0]!='A'){
        ans=false;
    }
    int c_num=0;
    for(int i=2; i<s.size()-1; i++){
        if(s[i]=='C'){
            c_num++;
        }
    }
    if(c_num!=1){
        ans=false;
    }

    int C_num=0;
    for(int i=0; i<s.size(); i++){
        int tmp=s[i]-'a';
        if(tmp<0 or tmp>25){
            C_num++;
        }
    }
    if(C_num!=2){
        ans=false;
    }

    if(ans==true){
        cout << "AC" << endl;
    }else{
        cout << "WA" << endl;
    }

    return 0;
}