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 5.4.1) (judge verdict: Accepted)

#include<stdio.h>
#include<string.h>

int main()
{
    char a[12];
    scanf("%s",a);
    int l=strlen(a);
    int c=0,k=0,n=0;
    if(a[0]=='A')
    {
        c++;
    }
    for(int i=2;i<l-1;i++)
    {
        if(a[i]=='C')
        {
            k++;
        }
    }
    if(k>0)
    {
        c++;
    }
    for(int i=0;i<l;i++)
    {
        if(a[i]>='A' && a[i]<='Z')
        {
            n++;
        }
    }
    if(n==2)
    {
        c++;
    }
    if(c==3)
    {
        printf("AC\n");
    }
    else
    {
        printf("WA\n");

    }

    return 0;
}