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: Accepted)

package main

import (
	"fmt"
	"unicode"
)

func count(s string, r rune) int {
	return count_range(s, r, 0, len(s))
}

func count_range(s string, r rune, from, to int) int {
	var cnt int
	for _, v := range s[from:to] {
		if v == r {
			cnt++
		}
	}
	return cnt
}

func count_lowers(s string) int {
	var cnt int
	for _, v := range s {
		if unicode.IsLower(v) {
			cnt++
		}
	}
	return cnt
}

func main() {
	var s string
	fmt.Scan(&s)
	if s[0] == 'A' && count(s, 'C') == 1 && count_range(s, 'C', 2, len(s)-1) == 1 &&
		count(s, 'A') == 1 && count_lowers(s) == len(s)-2 {
		fmt.Println("AC")
	} else {
		fmt.Println("WA")
	}
}