#include<bits/stdc++.h> using namespace std; int main(){ int o; string a; cin>>a; o=a.size(); for(int i=0;i<=o;i++){ if(a[i]==a[i+2]&&i+2<o||a[i]==a[i+3]&&a[i+1]==a[i+2]&&i+2<o){ cout<<"yes"; return 0; } } cout<<"no"; return 0; }