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<vector> 
#include<iomanip>
#include<cmath>
using namespace std;
int main() {
	ios::sync_with_stdio(false);
	string str;
	int i;
	while( cin>>str )
	{
		int flag=0,cnt=0;
		if( str.length()>10 )
		{
			str=str.substr(0,10);
		}
		for( i=2;i<str.length()-1;i++ )
		{
			if( !( str[i]>='a' && str[i]<='z' ) && str[i]!='C') //出现不是小写的字符又不是C的字符 
			{
					flag=1;
					break;
			}
			if( str[i]=='C' )
			{
				cnt++;
			}	
		}
		if( str[0]=='A' && ( str[1]>='a' && str[1]<='z' ) && flag==0 && ( str[ str.length()-1 ]>='a' && str[ str.length()-1 ]<='z' ) && cnt==1 )
			cout<<"AC\n";
		else
			cout<<"WA\n";
	/*	if( str[0]!='A' )
			cout<<"WA\n";
		else if( str[1]=='C' || str[ str.length()-1 ]=='C' || !( str[1]>'a' && str[1]<'z' ) || !( str[ str.length()-1 ]>'a' && str[ str.length()-1 ]<'z' ) )
				cout<<"WA\n";
		else 
		{
				for( i=2;i<str.length()-1;i++ )
				{
					if( !( str[i]>'a' && str[i]<'z' ) && str[i]!='C' ) //出现不是小写的字符又不是C的字符 
					{
						flag=1;
						break;
					}
					if( str[i]=='C' )
					{
						cnt++;
					}	 
				}
				if( flag==1 || cnt==0 || cnt>1 )
					cout<<"WA\n";
				else
					cout<<"AC\n";
		} */
	} 
	return 0;
}