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 string[15];
  gets(string);
  int i = 0;
  int f = 0;
  int c = 0;
  int lenth = sizeof(string)/sizeof(char);
  while(string[i] != '\0'){
    if (i==0) {
      if(string[i]!='A')f++;
    }
    else if(1<i && i<lenth-1){
      if(string[i]=='C')c++;
    }
    else{
      if('B'<= string[i]&& string[i]<='Z')f++;
      if(string[i]=='C')f--;
   }
  i++;

}

if(c==1&&f==0){
  printf("AC\n");
}else{
  printf("WA\n");
}
return 0;
}