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 9.2.1) (judge verdict: Wrong Answer)

#include <bits/stdc++.h>
using namespace std;
 
#define FAST ios_base::sync_with_stdio(0); cin.tie(); cout.tie();
 
#define MAXX 10005
 
#define PI   3.14159265358979323846264338327950
 
#define F first
#define S second
 
#define ll 	 long long int
 
#define mod  1000000007

map<char, int> m;
map<char, int> m1;
int main()
{
	FAST;
	string s;
	cin >> s;
	ll x = 0;
	for(ll i = 0; i < s.size(); i ++){
		if(s[i] >= 'A' && s[i] <= 'Z'){
			x++;
		}
		m[s[i]] ++;
		m1[s[i]] = i;
	}
	if(m['C'] == 1 && x == 2 && m1['C'] >= 2 && m1['C'] < s.size() -2 && m1['A'] == 0 && m['A'] == 1){
		cout << "AC";
		return 0;
	} 
	cout << "WA";
	return 0;
}