# include<iostream> using namespace std; bool is_pn(string s, int s1, int s2){ for(int i = 0; i < (s2-s1)/2; i++)if(s[s1+i]!=s[s2-1-i])return false; return true; } int main(){ string a; cin>>a; if(a.size()<=2){ cout<<"No"; return 0; } for(int i = 0; i <= a.size()-3; i++) for(int j = i; j <= a.size(); j++) if(a[i]==a[j-1]&&j-i>2&&is_pn(a, i, j)){ cout<<"Yes"; return 0; } cout<<"No"; return 0; }