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<stdbool.h>

char s[10], c;
int l, i, cnt;
bool ok = true;

int main(void){
        while((c=getchar())!='\n') s[l++] = c;
        for(i=0; i<l; i++){
                if('a'<=s[i] && s[i]<='z') cnt++;
                else if(s[i]=='C'){
                        if(i<2 || l-2<i) ok = false;
                }
                else if(s[i]=='A'){
                        if(i!=0) ok = false;
                }
                else ok = false;
        }
        if(ok && cnt==l-2) puts("AC");
        else puts("WA");
        return 0;
}