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<bits/stdc++.h>

using namespace std;

int main()
{
    char cc[15];
    scanf("%s",cc);
    if(cc[0]!='A')
        cout<<"WA"<<endl;
    else
    {
        int noc=0;
        int len=strlen(cc);
        int index;
        for(int i=2;i<=len-2;i++)
            if(cc[i]=='C')
            noc++,index=i;
        if(noc!=1)
            cout<<"WA"<<endl;
        else
        {
            for(int i=0;i<len;i++)
            {
                if(i==0||i==index)continue;
                if(cc[i]-'a'<0||cc[i]-'a'>25)
                {
                    cout<<"WA"<<endl;
                    return 0;
                }
            }
            cout<<"AC"<<endl;
        }
    }
}