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<stdbool.h>
#include<string.h>

int main(void){

  char S[10];
  scanf("%s",S);

  char mozi;
  bool judge = true;
  int length = strlen(S);
  int place = 0;
  int C_count = 0;


  //頭文字の大文字A判定
  mozi = S[0];
  if(mozi != 'A')  judge = false;

  
  //頭三文字目から後ろ二文字目までにCが一つか?
  for(int i = 2; i <= length - 1; i++){
    if(S[i] == 'C'){
      C_count++;
      place = i;                  //Cの場所記憶
    }
  }
  if(C_count != 1)    judge = false;

  
  //その他の文字が小文字か
  for(int i = 1; i < length ; i++){
    	if(i != place){
    
   	    mozi = S[i];
        if(mozi < 'a' || 'z' < mozi)      judge = false;
    
    }
  }

  
  //最終出力
  if(judge) puts("AC");
  else      puts("WA");
      
  return 0;
}