#include <stdio.h>
int main()
{
int N;
char C;
scanf("%d %c",&N,&C);
int i,j;
int lie;
int hang;
lie = N;
if(N%2 == 0)
{
hang = N/2;
}
else
{
hang = N/2 + 1;
}
for(j = 0; j < hang; j ++)
{
if(j == 0 || j == hang -1)
{
for(i = 0 ;i < N; i ++)
{
printf("%c",C);
}
}
else
{
printf("%c",C);
for(i = 1;i < N - 1;i ++)
{
printf(" ");
}
printf("%c",C);
}
if(j != hang -1)
{
printf("\n");
}
}
return 0;
}