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>
int main(){
	char ara[15];
	gets(ara);
	int n=strlen(ara);
	if(ara[0]!='A'){
		printf("WA\n");
		return 0;
	}
	int x=0,j;
	for(j=2;j<n-1;j++){
		if(ara[j]=='C') {
			x=0;
			break;
		}
		else x=1;
		
	}
	if(x==1){
		printf("WA\n");
		return 0;
	}
	for(int i=1;i<n;i++){
		if(i==j) continue;
		if(ara[i]>='a' && ara[i]<='z'){}
		else{
			printf("WA\n");
			return 0;
		}
	}
	printf("AC\n");
}