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(){
	char a[69];
	int i, j=0, flag=0, len;
	scanf("%s", &a);
	
	len = strlen(a);
	
	if(a[0] == 'A'){
		for(i=2; i<len-1; i++){
			if(a[i]=='C'){
				j =1;
				break;
			}
			
			if(j==0){
				printf("WA\n");
				return 0;
			}
		}
		
		for(i=0; i<len; i++){
			if(a[i]>='a' && a[i] <='z'){
				flag++;
			}
		}

		
		if(flag==len-2){
			printf("AC\n");
		}
		else{
			printf("WA\n");
		}
	}
	
	
	else{
		printf("WA\n");
	}
	
	
	return 0;
}