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 (Clang 3.8.0) (judge verdict: Accepted)


#include<stdio.h>
#include<string.h>
int main()
{
    int l,a,b,c,sum=0,temp=0,p=0,er=0,sp=0,o=0;
    char ch[100000];
    
    gets(ch);
    l=strlen(ch);
    int i,ty=0,se=0,re=0;
    if(ch[0]=='A')
    {
        sum=1;
    }
    
    for(i=2;i<l-1;i++)
    {
       if(ch[i]=='C')
        {
            temp++;
        }
    
    }
    if(temp==1)
    {
        er=1;
    
    }
    for(i=0;i<l;i++)
    {
        if(ch[i]>='A'&&ch[i]<='Z'&&ch[i]!='A'&&ch[i]!='C')
        {
            ty++;
        }
    }
    if(ty==0)
    {
        sp=1;
    }
    
    if(sp==1&&er==1&&sum==1)
    {
        printf("AC\n");
    }
    else
    {
        printf("WA\n");
    }
}