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 <math.h>
#include <stdlib.h>
#include <string.h>
int main (void){
        int len;
        int c=0;
        char S[10];
        scanf("%s",S);
        len=strlen(S);
        if (S[0]=='A'&&S[1]>=97&&S[1]<=122&&S[len-1]>=97&&S[len-1]<=122) {
          for (int i = 2; i <= len-2; i++) {
            if (S[i]=='C') {
              c++;
            }else if (!(S[i]>=97&&S[i]<=122)) {
              printf("WA\n");
              return 0;
            }
          }
          if (c==1) {
            printf("AC\n");
          }else{
          printf("WA\n");
          }
        }else{
            printf("WA\n");
        }
        return 0;
}