1234

#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;

}