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(void)
{
        int n,c,oomoji;
        int i;
        char s[12];

        scanf("%s",s);

        n = strlen(s);

        //A,C以外が小文字か確認
        i=0;
        oomoji = 0;
        while(s[i]!='\0'){
                if(s[i]>='A' && s[i]<='Z')
                        oomoji++;
                i++;
        }
        if(oomoji!=2){
                printf("WA\n");
                return 0;
        }


        //Aが先頭にあるか確認
        if(s[0]!='A'){
                printf("WA\n");
                return 0;
        }


        //Cが一つか確認
        c = 0;
        i = 2;
        while(i<n-1){
                if(s[i]=='C')
                        c++;
                i++;
        }
        if(c==0 || c>1){
                printf("WA\n");
                return 0;
        }


        printf("AC\n");
        return 0;
}