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++14 (GCC 5.4.1) (judge verdict: Accepted)

#include <iostream>
#include <cstring>
#include <string>
#include <algorithm>
#include <cstdio>
#include <cmath>
using namespace std;

int main(){
	string s;
	while(cin>>s){
		int len=strlen(s.c_str()),i,count=0,flag=1;
		if(s[0]!='A'){
			cout<<"WA"<<endl;
			continue;
		}
		for(i=2;i<len-1;i++){
			if(s[i]=='C'){
				count++;				
			}
		}
		if(count!=1){
			cout<<"WA"<<endl;
			continue;
		}
		for(i=0;i<len;i++){
			if(s[i]=='B'||(s[i]>='D'&&s[i]<='Z')){
				cout<<"WA"<<endl;
				flag=0;
				break;
			}
		}
		if(flag){
			cout<<"AC"<<endl;
		}		
	}
	return 0;
}