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 i=0,p=0,r=0;
    char a[100];
    gets(a);

    while(i<strlen(a)){
        if(i==0){
            if(a[0]!=65){
                r=-1;
                break;
            }
        }
        if(i>=1){
        if(i>=2&&a[i]==67){
            if(p==0) p=1;
            else if(p==1){
                r=-1;
                break; 
            }
        }
        else if(a[i]>=65&&a[i]<=90){
            r=-1;
            break;
        }  
        }
        i++;
    }
    if(a[i-1]=='C') r=-1;
    if(r==-1||p==0) printf("WA\n");
    else if(r==0) printf("AC\n");
    return 0;
}