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: Accepted)

#include<bits/stdc++.h>
#define ll long long
#define fast_io ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
#define mod 1000000007
using namespace std;
 
int main()
{
    fast_io
    ll i,j,n,x,ans=0;
    string s;
    bool fA=0,fc=0,noAZ=0;
    cin>>s;
        if(s[0]!='A'||(s[1]>='A'&&s[1]<='Z')||(s[s.length()-1]>='A'&&s[s.length()-1]<='Z'))
   return cout <<"WA"<<endl,0;
    ll cntc=0,cap=0;
    for(i=1; i<s.length()-1; i++)
    {
    if(i>=2&&i<s.length()-1)
    {
        if(s[i]=='C') cntc++;
    }
    if(s[i]>='A'&&s[i]<='Z') cap++;
    }
 
if(cap>1)
   return cout <<"WA"<<endl,0;
    if(cntc!=1)
   return cout <<"WA"<<endl,0;
   return cout <<"AC"<<endl,0;
    return 0;
}