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++ (GCC 9.2.1) (judge verdict: Accepted)

#include <iostream>
#include <cmath>
#include <algorithm>
using namespace std;
string check(string s)
{
	if( s[0] != 'A' )
		return "WA";
	int sum = 0;
	bool ch = false;
	for(int i = 0; i < s.size(); i++)
	{
		if( s[i] >= 'a' and s[i] <= 'z' )
			sum++;
		if( i > 1 and i < s.size()-1 and s[i] == 'C' )
			ch = true;
	}
	if( ch == false )
		return "WA";
	if( sum != s.size()-2 )
		return "WA";
	return "AC";
}
int main()
{
	string s;
	cin >> s;
	cout << check(s);
}