Problem:
Score : 100 points

Problem Statement

In AtCoder City, there are three stations numbered 1, 2, and 3.

Each of these stations is operated by one of the two railway companies, A and B. A string S of length 3 represents which company operates each station. If S_i is A, Company A operates Station i; if S_i is B, Company B operates Station i.

To improve the transportation condition, for each pair of a station operated by Company A and one operated by Company B, there will be a bus service connecting them.

Determine if there is a pair of stations that will be connected by a bus service.

Constraints

Each character of S is A or B.

|S| = 3

Input

Input is given from Standard Input in the following format:

S

Output

If there is a pair of stations that will be connected by a bus service, print Yes; otherwise, print No.

Sample Input 1

ABA

Sample Output 1

Yes

Company A operates Station 1 and 3, while Company B operates Station 2.

There will be a bus service between Station 1 and 2, and between Station 2 and 3, so print Yes.

Sample Input 2

BBA

Sample Output 2

Yes

Company B operates Station 1 and 2, while Company A operates Station 3.

There will be a bus service between Station 1 and 3, and between Station 2 and 3, so print Yes.

Sample Input 3

BBB

Sample Output 3

No

Company B operates all the stations. Thus, there will be no bus service, so print No.

Solution in Go (1.6) (judge verdict: Accepted)

package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

func main() {
	buf.Split(bufio.ScanWords)

	s := scanString()
	if s == "AAA" || s == "BBB" {
		fmt.Printf("%s", "No")
		return
	}
	fmt.Printf("%s", "Yes")
}

var buf = bufio.NewScanner(os.Stdin)

func scanInt() int {
	buf.Scan()
	i, _ := strconv.Atoi(buf.Text())
	return i
}

func scanInts(n int) []int {
	a := make([]int, n)
	for k, _ := range a {
		a[k] = scanInt()
	}
	return a
}

func scanString() string {
	buf.Scan()
	return buf.Text()
}

func scanStrings(n int) []string {
	a := make([]string, n)
	for k, _ := range a {
		a[k] = scanString()
	}
	return a
}