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){

    char s[16] = "", *p = s;
    int length = 0, i = 0, flg = 0, flg2 = 0;
    char result[3] = "AC";

    scanf("%s", s);

    while(1){
        if(*p++ != '\0')
            length++;
        else
            break;
    }

    for(i = 0; i < length; i++){
        flg2 = 0;
        if(i == 0){
            if(s[0] != 'A'){
                strcpy(result,"WA");
                break;
            }
            flg2 = 1;
        }
        else if( i >= 2 && i <= (length - 2)){
            if(s[i] == 'C'){
                if(flg != 0){
                    strcpy(result,"WA");
                    break;
                }
                flg = 1;
                flg2 = 1;
            }
        }
        if(!('a' <= s[i] && s[i] <= 'z') && flg2 == 0){
            strcpy(result,"WA");
            break;
        }
    }

    if(flg != 1)
        strcpy(result,"WA");


    printf("%s\n",result);
    return 0;
}