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#include <stdio.h>
#define xx int
#define xxx xxxx(scan)
#define xxxx(x) x##f
#define xxxxx xxxx(print)
#define xyx(x) for (i=0;i<x;++i)
#define xyz(x, z) x-z
#define xxy ;
int main(void){xx cx, cy, i xxy xxx("%d %d",\
&cx, &cy) xxy xyx(cx) xxxxx("#") xxy xxxxx("\n") xxy
while (cy-->2) {xxxxx("#");xyx(xyz(cx,2)) xxxxx(" ");
xxxxx("#\n") xxy}xyx(cx) xxxxx("#") xxy
xxxxx("\n") xxy return 0;}