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)
{
	int i,len,c=0;
	char s[11];
	scanf("%s",s);
	len=strlen(s);
	if(s[0]!='A'){
		printf("WA");
		return 0;
	}
	for(i=3;i<len-1;i++){
		if(s[i]=='C' && c==0)
			c=1;
		else if(s[i]=='C'){
			printf("WA");
			return 0;
		}
		else if(s[i]-'a'>25 || s[i]-'a'<0){
			printf("WA");
			return 0;
		}
	}
	if(c!=1){
		printf("WA");
		return 0;
	}
	if(s[len-1]-'a'>25 || s[len-1]-'a'<0){
		printf("WA");
		return 0;
	}
	if(s[2]-'a'>25 || s[2]-'a'<0){
		printf("WA");
		return 0;
	}
	printf("AC");
	return 0;
}