#include<bits/stdc++.h>

using namespace std;

string s;

bool judge(string s){

    for(int i = 0, j = s.size()-1; i < s.size(); ++i, --j){

        if(s[i] != s[j])  return false;

    }

    return true;

}

int main(){

    int n;

    while(cin >> s){

        cin >> n;

        bool ok = true;

        if(s.size() % n != 0){  puts("NO"); continue;  }

        int t = s.size() / n;

        for(int i = 0; i < s.size(); i += t)

            if(!judge(s.substr(i, t)))  {  ok = false;  break; }

        if(ok)  puts("YES");

        else puts("NO");

    }

    return 0;

}