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: Wrong Answer)

#include<iostream>
#include<string>
using namespace std;
int main(){
	string s;
	int i,k,m,n=0,f=0;
	cin >> s;
	if(s[0]!='A' || s[1]=='C' || s[s.size()-1]=='C')
        f=1;
	for(i=1;i<s.size();i++)
    {
        if(f)
            break;
        if(s[i]=='C')
            n++;
        if(s[i]>='A' && s[i]<='Z' || n>1 || s[i]=='A')
            f=1;
    }
    if(n==0)
        f=1;
    if(f==0)
        cout << "AC\n";
    else
        cout << "WA\n";
	return 0;
}