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 Ruby (2.7.1) (judge verdict: Wrong Answer)

s=gets.chomp.chars
dame=0
dame=1 if s[0]!="A" || s[1]=="C" || s[-1]=="C"
c=0
for i in 2...s.size
  dame=1 if s[i]=="A"
  c+=1 if s[i]=="C"
end
dame=1 if c>1 || c=0
for i in 1...s.size
  next if s[i]=="A" || s[i]=="C"
  dame=1 if s[i]!=s[i].downcase
end
puts dame==1 ? "WA":"AC"