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>
#include <stdlib.h>

int main(){
    int i,N,length;
    int bool=0;
    int count=0;
    int temp;
    char s[10];

    scanf("%s", s);
    length = strlen(s);

    if(length < 4 | length > 10){
        printf("WA\n");
        return 0;
    }

    bool = strncmp(&s[0], "A", 1);
    if(bool != 0){
        printf("WA\n");
        return 0;
    }

    for(i=2;i<length-1;i++){
        if(strncmp(&s[i], "C", 1) == 0){
            count++;
            temp = i;
        }
    }
    if(count != 1 ){
        printf("WA\n");
        return 0;
    }

    for(i=1;i<length;i++){
        if(i != temp){
            if(0 <= strncmp(&s[i],"a",1) && strncmp(&s[i],"z",1) <= 0 ){
                printf("OK\n");
            }
            else{
                printf("WA\n");
                return 0;
            }
        }
    }

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