// nthword.cpp : Defines the entry point for the console application.
//

#include<iostream>
#include<fstream>

using namespace std;

int main() {
	ifstream in("nthword.in");
	ofstream out("nthwird.out");
	 char alphabet[26];
	 in>>alphabet;
	 char begin = alphabet[0];
	 char end = alphabet[1];
	 int k,n;
	 in>>k>>n;
	 char* result = new char[k+1];

	 for ( int i = 0 ; i < k-n; i ++ ) {
		 result[i] = begin;
	 }
	 for ( int i = k-1 ; i >= k-n ; i-- ){
		 result[i] = end;
	 }
	 result[k] = '\0';
	 out<<result<<endl;
	 return 0;
}