#include<iostream> #include<cstring> using namespace std; int main(){ string s; cin>>s; int n=s.size(); for(int i=0;i<n;i++){ if(s[i]==s[i+2]&&i+2<n){ break; } if(s[i]==s[i+3]&&s[i+1]==s[i+2]&&i+3<n){ break; }else{ cout<<"No"; return 0; } } cout<<"Yes"; return 0; }