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(){
char S[256];

scanf("%s",S);

if(S[0] == 'A'){
	int a,i,q,w;
	for(i=0;S[i]!='\0';i++){
		//printf("a\n");
	}
	
	a=0;
	for(int j=2;j<i-1;j++){
		if(S[j]=='C'){
			a++;
			q=j;
		}
		
	}
	if(a==1){
		for(int i=0;S[i]!='\0';i++){
			if(i != 0 && i != q && S[i] >='A' && S[i] <='Z' ){
			printf("WA\n");
			w=1;
			break;
			}
		}
		if(w!=1)
		printf("AC\n");
		
		
		
		
	}else{
		printf("WA\n");
	}
}else{
	printf("WA\n");
}

return 0;
}