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 5.4.1) (judge verdict: Accepted)

#include <stdio.h>

int main(void)
{
	char s[12];
	int i, j, flg = 0, cnt, flgA = 0;

	scanf("%s", s);

	for (cnt = 0; s[cnt] != '\0'; cnt++);

	for (i = 0; i < cnt; i++)
	{
		if (s[i] >= 'A' && s[i] <= 'Z')
		{
			flgA++;
		}
	}
	
	if (flgA >= 3)
	{
		printf("WA");
	}
	else if (cnt == 4)
	{
		if (s[2] == 'C' && s[0] == 'A')
		{
			printf("AC");
		}
		else
		{
			printf("WA");
		}
	}
	else
	{
		for (i = 2; i <= cnt - 2; i++)
		{
			if (s[i] == 'C' && s[0] == 'A')
			{
				printf("AC");
				flg = 1;
				break;
			}
		}
		if (flg == 0)
		{
			printf("WA");
		}
	}
	
	return 0;
}