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: Wrong Answer)

#s[i] =~ /^[A-Z]/
#この A-Zの表現について考える。

s = gets.chomp.split("")
fff = 1
if s[0] != "A" && fff == 1
    puts "WA"
    fff -= 1
end
mojisize = s.size
count = 0
(2..(mojisize-2)).each do |i|
    if s[i] == "C"
        count += 1
    end
end
if count != 1 && fff == 1 
    puts "WA"
    fff -= 1
end
s.delete("A")
s.delete("C")
#p s
saigo = s.size
# p saigo
# p saigo
all = 0
# p s
# p saigo
(0..(saigo-1)).each do |i|
    if s[i] =~ /^[A-Z]/
        break
    else
        all += 1
    end
end
#p all

#p all
 if all == saigo && fff == 1
     puts "AC"
     fff -= 1
else
    puts "WA"
end