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>

int check(char str[]){
	int i=0, n, m, count=0, flag=0;
	while(str[i]) i++;
	
	n=3; m=i;
	for(i=n-1;i<=m-2;i++){
		if(str[i]=='C') count++;
		else if(str[i]<0x61||str[i]>0x7A) flag=1;
	}
	if(str[1]<0x61||str[1]>0x7A) return 1;//大文字
	else if(str[m-1]<0x61||str[m-1]>0x7A) return 1;//大文字
	else if(count!=1 || flag) return 1;
	else return 0;
}

int main(){
	char str[11];
	scanf("%s", str);
	
	if(str[0]!='A' || check(str)) printf("WA");
	else printf("AC");
}