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,W,a,b,k=0;
  while(k != -1){
  scanf("%d %d",&H,&W);
    for(b=1;b<=W;b++){
      for(a=1;a<=H;a++){
        if(b==1 || b==W || a==1 || a==H){
          printf("#");
        }else{
          printf(".");
        }
      }
    printf("\n");
    }
    printf("\n");
  }
  return 0;
}