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){
        int b=0,c=0;
        char a[10],d;
        scanf(" %s",a);
        for(int i=0;i<strlen(a);i++){
            if(isupper(a[i])==0) b++;
            if(i>1&&i<strlen(a)&&a[i]=='C') c++;
        }
        if(strlen(a)<4||10<strlen(a)) printf("WA\n");
        else if(a[0]!='A') printf("WA\n");
        else if(strlen(a)-2==b&&c==1) printf("AC\n");
        else if(strlen(a)-2!=b) printf("WA\n");
        return 0;
    }