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<cstdio>
#include<cstring>
using namespace std;
string s;
int main()
{
    cin>>s;
    int k;
    int flag=0;
    if(s[0]!='A')
    {
        printf("WA\n");
        return 0;
    }
    int i;
    for(i=0;i<s.size();i++)
    {
        if(s[i]=='C')
        {
            flag=1;
            k=i;
            break;
        }
    }
    if(flag)
    {
    for(i=1;i<s.size();i++)
    {
        if(i==k)continue;
        if(s[i]<'a'||s[i]>'z')break;
    }
    if(i==s.size())printf("AC\n");
    else printf("WA\n");
    }
    else printf("WA\n");
    return 0;
}