#include<bits/stdc++.h>
#define REP1(i,n,m) for(int i=n;i<=m;i++)
#define REP2(i,n,m) for(int i=n;i>=m;i--)
using namespace std;
void YN(bool f){if(f){cout<<"Yes"<<endl;}else{cout<<"No"<<endl;}}
int main(){
	string n;
	cin>>n;
	YN(n.size()==2);
}