#include <iostream> #include<cstring> using namespace std; int main() { char s[1000]; int i,n,flag = 1; cin >> s >> n; for(int i=0;i<=n/2;i++){ if(s[i] != s[n-1-i]){ flag = 0; break; } } if(flag) cout << "YES" << endl; else cout << "NO" << endl; }