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: Wrong Answer)

#include<bits/stdc++.h>
#define pb push_back
#define ll long long
#define FOR(i,a,n) for(int i = a; i < n; i++)
using namespace std;
 
const int N = 1e5+123;
ll a[N];
const long double PI = 3.14159265358979323846;

bool ok(string x)
{
    int c=0,a=0;
    sort(x.begin(),x.end());
    for(int i = 0; i < x.size();i++){
        if(x[i]=='C')c++;
        if(x[i]=='A')a++;
    }
    return (c==1 && a==1);
}

bool ok1(string x)
{
    sort(x.begin(),x.end());
    for(int i = 2; i<x.size();i++)
        for(char j = 'a'; j<='z';j++)
            if(x[i]==j)
                return 1;
    return 0;
}
int main()
{
    string s;
    cin >> s;
    int c =0;
    if(s[0] == 'A')
    {
        
        if(ok(s)&&  ok1(s))
            puts("AC");
        else
            puts("WA");
            
    }else
        puts("WA");
    return 0;  
}