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<cstdio>
#include<cstdlib>
#include<cstring>
#include<map>
#include<cmath>
#include<string>
#include<vector>
#include<set>
#include<queue>
#include<stack>
#include<iostream>
#include<algorithm>
using namespace std;

#define debug(x) cout << #x << " = " << x << endl
#define lowbit(x) (x & (-x))

typedef long long LL;
typedef pair<int, int>PII;
const int maxn = 1e5 + 10;

char a[maxn];
int main(){
	scanf("%s", a + 1);
	int len = strlen(a + 1);
	bool vis = true;
	for(int i = 1; i <= len ; i ++){
		if(i == 1 && a[i] != 'A') vis = false;
		else if(i == 3 && a[i] != 'C') vis = false;
		else if(a[i] > 'z' || a[i] < 'a') vis = false;
	}
	if(vis) printf("AC\n");
	else printf("WA\n");
	return 0;
}