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 main(void)
{

  char S[10];
 scanf("%s",S);
 if(S[0]=='A'){
 	
 	int n;
 	int flag=0;
 	for(n=2;n<strlen(S)-2;n++){
 		if(S[n]=='C'){
 			if(flag==0){
 			flag=1;
 			}else{
 				flag=0;
 				break;
 			}
 		}
 		
 	}

 	if(flag){
 		int sum=0;
 		for(n=0;n<strlen(S);n++){
 			if(S[n]>=97&&S[n]<=122){
 				sum++;
 			}
 		}
 		
 		if(sum==strlen(S)-2){
 			printf("AC\n");
 		}else{
 			printf("WA\n");
 		}
 		
 	}else{
 		printf("WA\n");
 	}
 	
 }else{
 	printf("WA\n");
 }
  	
  
  
  
	return 0;
}