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>

int main(void){

	int i,moji,ccount=0;
	char s[10];
	scanf("%s",s);	
	
	for(moji=0; s[moji]!='\0'; moji++);

	for(i=0; i<moji; i++){
		if((s[i] == 'B') | (s[i]>='D' && s[i]<='Z') | s[0] != 'A'){
			printf("WA\n");
			return 0;
		}
	}
	
	printf("%c\n",s[moji-2]);
	
	for(i=2; i<=moji-2; i++){
		if(s[i] == 'C') ccount++;
		if(ccount >= 2 | ccount == 0){
			printf("WA\n");
			return 0;
		}
	}
	
	printf("AC\n");
	
    return 0;
}