#include <iostream> #include <vector> #include <set> #include <queue> #include <stack> #include <math.h> #include <cassert> #include <bitset> #include <map> #include <algorithm> #include <iterator> #include <string> #include <utility> #include <numeric> #include <regex> #include <complex> #include <random> #include <atcoder/all> using namespace atcoder; using namespace std; using ll=long long; using ull=unsigned long long; using P=pair<ll,ll>; template<typename T>using minque=priority_queue<T,vector<T>,greater<T>>; template<typename T>bool chmax(T &a,const T &b){return (a<b?(a=b,true):false);} template<typename T>bool chmin(T &a,const T &b){return (a>b?(a=b,true):false);} template<typename T1,typename T2> ostream &operator<<(ostream &os,const pair<T1,T2>&p){ os<<p.first<<" "<<p.second; return os; } template<typename T1,typename T2> istream &operator>>(istream &is,pair<T1,T2>&p){ is>>p.first>>p.second; return is; } template<typename T> istream &operator>>(istream &is,vector<T> &a){ for(auto &i:a)is>>i; return is; } #define reps(i,a,n) for(int i=(a);i<(n);i++) #define rep(i,n) reps(i,0,n) #define all(x) x.begin(),x.end() ll myceil(ll a,ll b){return (a+b-1)/b;} int main(){ string s; cin>>s; if(s[0]==s[1]&&s[1]!=s[2])cout<<"Yes"<<endl; else cout<<"No"<<endl; }