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: Accepted)

#include <stdio.h>
#include <string.h>
#include <ctype.h>

int main(void){
	char S[11];
	scanf("%s",&S);
	int l = strlen(S), c=0, i, j;
	int flag=0;
	
	if(S[0] == 'A'){
		for(i=2;i<l-1;i++){
			if(S[i] == 'C'){c++;j=i;}
		}
		if(c==1){
			flag = 1;
			for(i=1;i<l;i++){
				if(i!=j){
					if(islower(S[i])==0){//islower() 小文字でなければ0を返す、小文字なら0以外を返す
						flag = 0;
					}
				}
			}
		}
	}
	if(flag==1)	printf("AC");
	else printf("WA");
	return 0;
}