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"

func main(){
	var S string
	var f1, f2 int
	fmt.Scan(&S)
	f1 = 0
	f2 = 0

	if S[0] == 'A' {
		if 'a' <= S[1] && S[1] <= 'z' {
			f1++
		}
	}
	for i := 2 ; i <= len(S)-2 ; i++ {
		if S[i] == 'C' {
			f1++
		}else{
			f2++
		}
	}

	if 'a' <= S[len(S)-1] && S[len(S)-1] <= 'z' {
		f1++
	} 
	if f1 == 3 && f2 == len(S) - 4 {
		fmt.Println("AC")
	}else {
		fmt.Println("WA")
	}
	//fmt.Println(f1, f2)
	/*	for i := 1 ; i < len(S) ; i++ {
			if i == 1 && i == len(S)-1{
				if 'a' <= S[i] && S[i] <= 'z' {
					if 2 <= i && i <= len(S)-2 {
						if S[i] == 'C'{ f++ }
					}
				}
			}
		}
		
		
	}*/
}