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: Wrong Answer)

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

int main(){
  char s[11];
  int first = 0;
  scanf("%s",&s);
  int len=strlen(s);
  if(s[0]=='A'){
    for(int i=2;i<len-3;i++){
      if(s[i]=='C'){
        first = 1;
      }
    }
  }
  if(first==0){
    printf("WA\n");
    return 0;
  } else {
    for(int i=0;i<len-1;i++){
      if(s[i]!='A'&&s[i]!='C'){
        if(s[i]>='a'&&s[i]<='z'){
        } else {
          printf("WA\n");
          return 0;
        }
      }
    }
  }
  printf("AC");
  return 0;
}