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: Wrong Answer)

#include <stdio.h>
#include <string.h>

int wa() {
	printf("WA");
	return 0;
}

int main() {
	char S[10];
	int d, a, c = 0;
	scanf("%s", &S);
	d = strlen(S);
	a = d - 3;
	for (int i = 0; i < d; i++) {
		if (S[i] == 'C') {
			c++;
			if (c >= 2) {
				wa();
				return 0;
			}
		}
	}
	if(S[0] == 'A') {
		for (int b = 2; b <= a; b++) {
			if (S[b] == 'C') {
				printf("AC");
			}
		}
		wa();
	}
	else {
		wa();
	}
}