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<ctype.h>
int main()
{
    char s[10];
    int len,ch=0,i,pos,upp=0;
    gets(s);
    len=strlen(s);
	if(len>=4&&len<=10)
    {
        if(s[0]!='A')
            printf("WA\n");
        else
        {
            for(i=2; i<len-1; i++)
            {
                if(s[i]=='C')
                {
                    ch++;
                    pos=i;
                }
            }
            if(ch==1)
            {
                for(i=1; i<=len-1; i++)
                {
                	if(i==pos)
						continue;
                   else if(isupper(s[i]))
                    {
                        upp++;
                        break;
                    }
                    else
                        continue;
                }
                if(upp==0)
                    printf("AC\n");
                else
                    printf("WA\n");
            }
            else
				printf("WA\n");
        }
    }
return 0;
}