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<stdlib.h>
#include<string.h>
#include<math.h>

#define INT_MAX 2147483647

int main(void){
    char S[11];
    scanf("%s", S);
    if(S[0] != 'A') {
        printf("WA\n");
        return 0;
    }

    int C = 0;
    int i;
    int Cindex = 0;
    for(i=2; i <= strlen(S) - 2; i++) {
        if(S[i] == 'C') {
            C++;
            Cindex = i;
        }
    }
    if(C != 1) {
        printf("WA\n");
        return 0;
    }

    for(i=1; S[i] != '\0'; i++) {
        if(i != Cindex) {
            if(S[i] < 'a' || S[i] > 'z') {
                printf("WA\n");
                return 0;
            }
        }
    }
    printf("AC\n");
    return 0;
}