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 S[10];
  int i,j,n;
  scanf("%s",S);
  int len = strlen(S);

  if(S[0]!='A'){printf("WA");return 0;}

  n=0;
  for(i=2;i<len-1;i++){
    if(S[i]=='C'){n++;j=i;}}
  if(n!=1){printf("WA");return 0;}

  for(i=1;i<j;i++){
    if('A'<=S[i]&&S[i]<='Z'){printf("WA");return 0;}
  }
  for(i=j+1;i<len;i++){if('A'<=S[i]&&S[i]<='Z'){printf("WA");return 0;}
  }

  printf("AC");
  return 0;
}