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 <iostream>
#include <bits/stdc++.h>
#include <string>
#include <math.h>
#include <vector>
using namespace std;
int main(){
    string s; cin>>s;
    bool ans=true;
    int count=0;
    int num=0;
    int size=s.length();
    int size1=size-1;
    //cout<<size<<endl;
    if(s[0]!='A') ans=false;
    else{
        //cout<<0;
        for(int i=2;i<size1;i++){
            //int num=0;
            if(s[i]=='C'){
                count++;
                num=i;
            }
        }
        cout<<num<<endl;
        if(count!=1) ans=false;
        else{
            for(int i=1;i<s.length();i++){
                if(i!=num){
                    if(isupper(s[i])){
                        ans=false;
                        break;
                    } 
                }
            }
        }
    }
    if(ans) cout<<"AC"<<endl;
    else cout<<"WA"<<endl;
    return 0;
}