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()
{
    char s[15];
    gets(s);
    int i, j, f=0, l;
    if(s[0]!='A'){
        printf("WA\n");
        return 0;
    }
    
    l=strlen(s);
    
    if((s[1]<=90 && s[1]>=65 )||( s[l-1]<=90 && s[l-1]>=65) && ((s[1]!='C' && s[1]!='A') || (s[l-1]!='C' && s[l-1]!='A')) ){
        printf("WA\n");
        return 0;
    }
    
    for(i=2; i<l-1; i++){
        if(f==0 && s[i]=='C') {
            f=1;
            continue;
        }
        if(s[i]<=90 && s[i]>=65){
            printf("WA\n");
            return 0;
        }
    }
    if(f==0){
        printf("WA\n");
        return 0;
    }
    
    printf("AC\n");
    
    return 0;
}