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 (2.3.3) (judge verdict: Accepted)

s= gets.chomp
count=0
flag = false
flag2 = true
s[2..s.size-2].split("").each do |a|
  if a=="C"
    count+=1
    flag=true
  end
  if count>=2
    flag = false
    break
  end
end

s[1..s.size-1].split("").each do |a|
  if (a >="A" && "B">=a) || (a >="C" && "Z">=a)
    flag2==false
  break
  end
end

  if s[0]== "A" && flag ==true && flag2==true && (!(s[1] >="A" && "Z">=s[1])) && (!(s[s.size-1] >="A" && "Z">=s[s.size-1]))
  puts "AC"
else
  puts "WA"
end