import java.util.Scanner; import java.util.Arrays; import
java.io.*; public class Main { public static void main(String[] args) throws Exception { Scanner scan = new Scanner(
System.in); int N = scan.nextInt(); scan.nextLine(); String[] str = new String[N]; for(int i = 0;i<N;i++){ str[i]=scan.nextLine(); } int k = scan.nextInt(); scan.nextLine(); char sub =
scan.next().charAt(0); System.out.println(Arrays.toString(str)); solve(str,sub,k,N); } public static void solve(String[] str,char sub,int k,int N){ StringBuffer sb = new StringBuffer(); for(int i = 0;i<N;i++){ sb.append(str[i].substring(0,k)).append(sub).append(str[i].substring(k)); System.out.println(sb); sb.setLength(0); } } }