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 Go (1.6) (judge verdict: Wrong Answer)

package main

import (
	"fmt"
)

func main() {
	var s string
	fmt.Scan(&s)

	result := "WA"
	nowC := 0
	if string(s[0]) == "A" {
		count := 0
		for i := 2; i < len(s)-1; i++ {
			if string(s[i]) == "C" {
				count++
				nowC = i
			}
		}
		if count != 1 {
			fmt.Println("WA")
			return

		}
		for i := 1; i < len(s); i++ {
			if s[i] > 123 && i != nowC {
				result = "WA"
				break
			}
		}
		result = "AC"

	} else {
		result = "WA"
	}
	fmt.Println(result)

}