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 str[100];
  int i,j,k=0;
  
  scanf("%s",str);
  
  if(str[0] != 'A'){
    puts("WA");
    return 0;
  }
  
  if(!(str[1]>=97&&str[1]<=122)){
    puts("WA");
    return 0;
  }
  
  for(i=2;i<strlen(str)-1;i++){
    if(str[i] == 'C'){
      k++;
      continue;
    }
    if(!(str[i]>=97&&str[i]<=122)){
      puts("WA");
      return 0;
    }
  }
  
  for(i=strlen(str)-1;i < strlen(str);i++){
    if(!(str[i]>=97&&str[i]<=122)){
    puts("WA");
    return 0;
  }
  }
  
  if(k == 1){
    puts("AC");
    return 0;
  }
  
  puts("WA");
  return 0;
}