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: Runtime Error)

#include <stdio.h>
void judge(char *);
int main()
{
    char S[10];
    scanf("%s",S);
    judge(S);
    return 0;
}
void judge(char *s){
    int count=0,date1=0,date2=0;
    for(;*s!='\0';s++)date1++;

    for(int i =s[2];i<=s[date1-2];i++){
            if(*s=='C'){
               count++;
               *s=('C'+(*s-'c'));
            }
        }
        for(;*s!='\0';s++){
        if(*s>='a' && *s<='z'){
                date2++;
            }
        }
    if((s[0]=='A')&&(count==1)&&(date1-1==date2)){
        printf("AC");
    }else{
        printf("WA");
    }

    
}