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)

int main(){
int H,W,x,y,z,a;

for(x=0;1;x++){
scanf("%d%d",&H,&W);
      for(y=0;y<W;y++){
      printf("#");
      }
      for(z=0;z<H-2;z++){
      printf("#");
      for(a=0;a<W-2;W++){ 
                     printf(".");
                     }
       printf("#");
       }
      for(y=0;y<W;y++){
      printf("#");
      }
}
return 0;
}