# This function reads a map from a file named filename, and creates a map, m.
# Please declare "m" as a list before calling the function and then pass it in. 
def readMap(m, filename):
  mapFile = open(filename, "r")
  lines = mapFile.readlines()
  for line in lines:
    line = line.strip()
    row = [c for c in line]
    m.append(row)