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 C++14 (GCC 5.4.1) (judge verdict: Accepted)

#include<bits/stdc++.h>
#define ll long long int
#define fl(i,x,y) for( int i=x;i<y;i++)
#define w(t) while(t--)
#define vi vector<ll>
#define vvi vector< vi >
#define si set<ll>
#define msi multiset<ll>
#define si_d set<ll, greater<ll> >
#define mii map<ll,ll>
#define pb push_back
#define msi_it  multiset<ll> :: iterator
#define si_it set<ll> :: iterator
#define sort1(v) sort(v.begin(),v.end());
#define F first
#define S second
using namespace std;
#define N 1000000007
#define mod 15000000000031
int main()
{
	string s;cin>>s;
	int a=0,b=0;
	fl(i,0,3)
	{
		if(s[i]=='A') a++;
		else b++;
	}
	if(a==0 || b==0) cout<<"No";
	else cout<<"Yes";
}