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: Wrong Answer)

 #include<stdio.h>
 #include<string.h>
 int main(void)
 {
     char S[11];
     int i,j=0,k=0,s=0;

     scanf("%s",S);
     s=strlen(S);

     if(S[0]=='A')
       for(i=0;i<=s-2;i++){
         if(S[i+2]=='C')
           j++;
       }

     if(j==1){
       for(i=0;i<s;i++){
         if((S[i]>='a')&&(S[i]<='z'))
           k++;
       }
     }

     if(k==s-2) printf("AC\n");
     else printf("WA\n");

     return 0;
 }