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>
 
int main(void){
 
  int i,j;
  int a=0;
 
  char S[10];
  /* 文字を入力 */
  scanf("%s", S);
     for (i = 0;S[i] != '\0';i++);
    if(S[0] != 'A'){
        goto WA;
    }
    else if(i < 4 || i > 10){
        goto WA;
    }
    else if((S[1]>= 'A') && (S[1]<='Z')){
        goto WA;

    }
    else if((S[i-1]>= 'A') && (S[i-1]<='Z')){
        goto WA;

    }
    else{
        for(j = 2;j < i-1; j++){
            if((S[j]>= 'A') && (S[j]<='Z')){
                if(S[j] != 'C'){
                    goto WA;
                }
                else{
                    a = a + 1;
                }
            }
        }
    }
    if(a == 1){
printf("AC");
goto End;
    }
    else goto WA;
WA:
printf("WA");

End:
 
  return 0;
}