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(void){
  char str[10],alf[25]="A,B,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z";
  int i=1,j,f=0;
  scanf("%s",str);
  if(str[0]=='A'){
    for(j=0;j<25;j++){
       if(alf[j]==str[i]){
         f=2;
       }
    } 
    for(i=2;i<(strlen(str)-2);i++){
      if(str[i]=='C'){
        f++;
      }else{
        for(j=0;j<25;j++){
          if(alf[j]==str[i]){
            f=0;
          }
        }
      }
    }
   for(j=0;j<25;j++){
       if(alf[j]==str[i]){
         f=0;
       }
    } 
  }
  if(f==1){
      printf("AC");
  }else{
    printf("WA");
  }
  return 0;
}