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++14 (GCC 5.4.1) (judge verdict: Accepted)

#include<bits/stdc++.h>
using namespace std;
int main(){
    string str;
    cin>>str;
    bool flag=true;
    if(str[0]!='A') flag=false;
    bool judge2=false;
    for(char j='a';j<='z';j++){
        if(str[1]==j) judge2=true;
    }
    if(!judge2) flag=false;
    int cnt=0;
    for(int i=2;i<str.size()-1;i++){
        if(str[i]=='C'){
            cnt++;
            continue;
        }
        bool judge=false;
        for(char j='a';j<='z';j++){
            if(str[i]==j) judge=true;
        }
        if(!judge) flag=false;
    }
    if(cnt!=1) flag=false;
    bool judge3=false;
    for(char j='a';j<='z';j++){
        if(str[str.size()-1]==j) judge3=true;
    }
    if(!judge3) flag=false;
    if(flag) cout<<"AC"<<endl;
    else cout<<"WA"<<endl;
    
    return 0;
}