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;

#define ll long long int
#define ld long double
#define pii pair<int,int>
#define X first
#define Y second
#define mp make_pair
#define pb push_back
#define ppb pop_back
#define bit(a,b) ((a>>b)&1)
#define IOS ios_base::sync_with_stdio(false), cin.tie(0), cout.tie(0)

const ll mx = 1e6+1, Mod = 1e9+7;

int n;

int main()
{
    string s;
    cin >> s;
    if(s[0]!='A')
        return cout << "WA", 0;
    int c=0;
    for(int i=2;i<s.size()-1;i++)
        if(s[i]=='C')
            c++, s[i]='c';
    if(c!=1)
        return cout << "WA", 0;
    for(int i=1;i<s.size();i++)
        if(s[i]<'a')
            return cout << "WA", 0;
    cout << "AC";
    return 0;
}