output_description: For each dataset, print the rectangle made of H × W '#'.
  
  Print a blank line after each dataset.
input_description: 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).
attempt: x, y = map(int, input().split())
  while not(x == 0 and y == 0):
  	print(x*((y*'#')+'\n'))
  	x, y = map(int, input().split())
  
problem_description: Print a Rectangle
  
  Draw a rectangle which has a height of H cm and a width of W cm. Draw a 1-cm
  square by single '#'.
samples: [{"input": "4\n    5 6\n    2 2\n    0 0", "output": "####\n    ####\n    ####\n    \n    ######\n    ######\n    ######\n    ######\n    ######\n    \n    ##\n    ##"}]