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;

int main()
{
	string S;
	cin>>S;
	if(S[0]=='A')
	{
		bool flag=0;
		int p=(int)S.length();
		for(int a=2;a<=p-2;a++)
		{
			if(S[a]=='C')
			{
				if(!flag) flag=1;
				else if(flag)
				{
					flag=0;
					break;
				}
			}
		}
		int cnt=0;
		for(int a=0;a<S.length();a++)
		{
			if(isupper(S[a]))
			{
				cnt++;
			}
		}
		if(cnt > 2) flag=0;
		if(flag) cout<<"AC";
		else cout<<"WA";
	}
	else
	{
		cout<<"WA";
	}
	return 0;
}