#include <queue>
#include <math.h>
#include <stack>
#include <stdio.h>
#include <iostream>
#include <vector>
#include <iomanip>
#include <string.h>
#include <algorithm>
using namespace std;
#define int long long
#define float double
#define N 0x1c9c38a
#define INF 0xc00000fd
#define scf scanf
#define ptf printf
#define gtc getchar
#define ptc putchar
#define psp ptc(' ')
#define pel ptc('\n')
queue<int> Q;
stack<int> S;
vector<int> V;
vector<int> travel(vector<int> A, vector<int> B, vector<int> U, vector<int> V, vector<int> W);
#ifndef SOMETHING_H
#define SOMETHING_H
#endif
inline int wei(int n){
	int cnt = 0;
	while(n > 0){
		n /= 10;
		cnt++;
	}
	return cnt;
}
inline bool isPrime(int n){
	if(n < 2)
		return 0;
	for(int i = 2; i * i <= n; ++i)
		if(n % i == 0)
			return 0;
	return 1;
}
inline int read(string n){
	int x = 0, f = 1;
	ptf("%s", n.c_str());
	char c = gtc();
	while(c < '0'  ||  c > '9'){
		if(c == '-')
			f = -1;
		c = gtc();
	}
	while(c >= '0'  &&  c <= '9'){
		x = x * 10 + c - 48;
		c = gtc();
	}
	return x * f;
}
inline float input(string n){
	float x = 0, f = 1, x2 = 0, cnt = 0, i = 0;
	ptf("%s", n.c_str());
	char c = gtc();
	while(c < '0'  ||  c > '9'){
		if(c == '-')
			f = -1;
		c = gtc();
	}
	while(c >= '0'  &&  c <= '9'){
		x = x * 10 + c - 48;
		c = gtc();
	}
	c = gtc();
	while(c >= '0'  &&  c <= '9'){
		x2 = x2 * 10 + c - 48;
		cnt++;
		c = gtc();
	}
	for(; i < cnt; i++)
		x2 /= 10.0;
	return (x + x2) * f;
}
inline void write(int n){
    if(n < 0){
        ptc('-');
        n = -n;
    }
    if(n > 9)
		write(n / 10);
    ptc(n % 10 + '0');
	return;
}
#define read() read("")
#define input() input("")
int n = read(), m = read();
char c = gtc();
bool b = read();
inline void t(){
	for(int i = 1; i <= n; i++){
		for(int j = 1; j <= m; j++)
			ptc(c);
		pel;
	}
	return;
}
inline void f(){
	for(int i = 1; i <= m; i++)
		ptc(c);
	pel;
	for(int i = 2; i < n; i++){
		ptc(c);
		for(int j = 2; j < m; j++)
			psp;
		ptc(c);
		pel;
	}
	for(int i = 1; i <= m; i++)
		ptc(c);
	return;
}
inline void Main(){
	b   ?   t() :   f();
	return;
}
signed main(signed argc, char **argv){
	Main();
	pel;
	return 0;
}