avenues = 10 streets = 10 robot = (1, 1, 'E', 0) walls = [] beepers = { (4, 10): 1, (3, 2): 1, (2, 6): 1, (6, 3): 4, (8, 1): 1, (7, 6): 5, (5, 7): 1, (3, 8): 2, (9, 5): 2, (2, 5): 1, (7, 9): 3, (3, 5): 2 }