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 x[11];
  char y[11];
  int i,j=0;
  scanf("%s", x);
  for(i=0;i<strlen(x);i++){
    if(x[i]>='A'&&x[i]<='Z'){
      y[j]=x[i];
      j++;
    }
  }
  y[j]='\0';
  if(x[0]=='A'&&strlen(y)==2&&y[1]=='C'&&x[strlen(x)-1]!='C'&&x[1]!='C'){
    printf("AC\n");
  }
  else{
    printf("WA\n");
  }
  printf("x[0]=%c strlen(y)=%d y[1]=%c x[strlen(x)-1]=%c x[1]=%c\n",x[0],strlen(y),y[1],x[strlen(x)-1],x[1]);
  return 0;
}