Problem:
Print a Frame

Draw a frame which has a height of H cm and a width of W cm. For example, the following figure shows a frame which has a height of 6 cm and a width of 10 cm.

##########
#........#
#........#
#........#
#........#
##########

Input

The input consists of multiple datasets. Each dataset consists of two integers H and W separated by a single space.

The input ends with two 0 (when both H and W are zero).

Output

For each dataset, print the frame made of '#' and '.'.

Print a blank line after each dataset.

Constraints

3 ≤ H ≤ 300

3 ≤ W ≤ 300

Sample Input

3 4
5 6
3 3
0 0

Sample Output

####
#..#
####

######
#....#
#....#
#....#
######

###
#.#
###

Solution in C (judge verdict: Time Limit Exceeded)

#include<stdio.h>

int main(void){

  int H;//???
  int W;//?¨?
  int i,j;

  scanf("%d %d",&H,&W);

  while(1){


    if(H==0 && W==0)
      break;

    else{
      for(i=0;i<H;i++){
        if(i==0 || i==H-1){
          for(j=0;j<W;j++){
            printf("#");
          }
          printf("\n");
        }
        else{
          printf("#");
          for(j=1;j<W-1;j++){
            printf("???");
          }
          printf("#\n");
        }
      }printf("\n");
    }
  }
  return 0;
}