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)

// AtCoder ABC104: B - AcCepted
// 2019.9.10 bal4u

#include <stdio.h>

char S[15];

int main()
{
	int i, j;
	
	scanf("%s", S);
	if (S[0] != 'A') goto WA;
	j = -1; for (i = 1; S[i]; i++) {
		if (S[i] == 'C' && j < 0) j = i;
		else if (S[i] >= 'A' && S[i] <= 'Z') goto WA;
	}
	if (j < 2 || j > i-2) goto WA;
	puts("AC");
	return 0;
WA: puts("WA");
	return 0;
}