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 "bits/stdc++.h"
using namespace std;
const int MOD = 1e9 + 7;
typedef long long lint;
const int INF = 1e7;
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define repi(i, k, n) for (int i = (k); i < (int)(n); ++i)
typedef pair<int, int> P;
typedef vector<int> vi;
typedef vector<vi> vvi;
#define all(x) (x).begin(), (x).end()
#define pb push_back
int main()
{
    string s;
    cin >> s;
    bool flag1 = true;
    if (s[0] != 'A')
    {
        flag1 = false;
    }
    bool flag2 = false;
    int t;
    for (int i = 2; i < s.size() - 1; i++)
    {
        if (s[i] == 'C')
        {
            flag2 = true;
            t = i;
        }
    }
    bool flag3 = true;
    rep(i, s.size())
    {
        if(i==0 || i==t){
            continue;
        }
        if ('a' <= s[i] && s[i] <= 'z')
        {
        }
        else
        {
            flag3 = false;
        }
    }
    if(flag1 && flag2 && flag3){
        cout << "AC" << endl;
    }else{
        cout << "WA" << endl;
    }
    return 0;
}