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<set>
#include<map>
#include<cmath>
#include<ctime>
#include<queue>
#include<cstdio>
#include<string>
#include<vector>
#include<cstdlib>
#include<cstring>
#include<iomanip>
#include<iostream>
#include<algorithm>
#define pb push_back
#define lowbit(x) x&(-x)
#define PII  pair<int, int> 
#define FAST ios::sync_with_stdio(false)
typedef long long ll;
const int inf = 0x3f3f3f3f;
const int mod = (int)1e9 + 7;
const int maxn = (int)2e5 + 5;
using namespace std;


int main()
{
	string s;
	cin >> s;
	bool flag = true;
	if(s[0] != 'A') flag = 0;
	int cnt = 0;
	for(int i = 0; i < s.size(); i++){
		if(s[i] == 'C' && (i == 1 || i == 2)) cnt++;
		if(s[i] == 'C' && i != 1 && i != 2) flag = false;
		if(i != 0 && i != 2 && s[i] >= 'A' && s[i] <= 'Z') flag = false;
	}
	if(flag && cnt == 1) puts("AC");
	else puts("WA");
	return 0;
}