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 len, flag, i, j, p;
	
	scanf("%s", &a);
	len = strlen(a);
	
	if(a[0]=='A' && a[1]>='a' && a[1]<='z'){
		flag = 2;
	}
		
	else{
		printf("WA\n");
		return 0;
	}
	
	
	for(i=2; i<len-1; i++){
		if(a[i]>='C'){
			p = i;
			flag = 3;
			break;
		}
	}
		
	for(i=2; i<p; i++){
		if(a[i]>='C' && a[i]<='Z'){
			printf("WA\n");
			return 0;
		}
		else{
			flag++;
		}
	}
	
	
	for(i=p+1; i<len; i++){
		if(a[i]>='C' && a[i]<='Z'){
			printf("WA\n");
			return 0;
		}
		else{
			flag++;
		}
	}
	
	if(flag==len){
		printf("AC\n");
	}
return 0;	
}