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#!/usr/bin/env python
"""New and improved bot, OPTIMISED!!"""
import random
import sys
DEBUG = False
# Show tracebacks, then pause for debugging.
if DEBUG:
sys_excepthook = sys.excepthook
def excepthook(*args, **kwargs):
sys_excepthook(*args, **kwargs)
import time
time.sleep(10)
sys.excepthook = excepthook
EMPTY_TILE = '.'
APPLE_TILE = '*'
WIDTH, HEIGHT, SNAKE_BODY = raw_input().split()
WIDTH = int(WIDTH)
HEIGHT = int(HEIGHT)
SNAKE_BODY = SNAKE_BODY.lower()
SNAKE_HEAD = SNAKE_BODY.upper()
HEADX = None
HEADY = None
SNAKE_LENGTH = 0
def get_cell(board, x, y):
if x < 0 or x >= WIDTH or y < 0 or y >= HEIGHT:
raise KeyError, 'out of range.'
return board[y][x]
BOARD = []
for y in xrange(HEIGHT):
row = raw_input()
for x, char in enumerate(row):
if char == SNAKE_HEAD:
HEADX = x
HEADY = y
elif char == SNAKE_BODY:
SNAKE_LENGTH += 1
BOARD.append(row)
MOVES = (
(-1, 0, 'l'),
(1, 0, 'r'),
(0, -1, 'u'),
(0, 1, 'd')
)
def get_score(x, y, n, done=None):
if done is None:
done = set()
done.add((x, y))
score = 0
explore = False
# See if the cell exists.
try:
square = get_cell(BOARD, x, y)
except KeyError:
return 0
# Give some extra points for getting an apple.
if square == APPLE_TILE:
explore = True
score += 50
# Yay - it's empty!
elif square == EMPTY_TILE:
explore = True
score += 10
elif square.islower():
score -= 1
if explore and n > 0:
# Explore n-1 cells further.
for dx, dy, move in MOVES:
nx = x + dx
ny = y + dy
if (nx, ny) in done:
continue
subscore = get_score(nx, ny, n - 1, done)
score += subscore / 10
return score * n
max_score = None
max_moves = []
for dx, dy, move in MOVES:
score = 0
x = HEADX + dx
y = HEADY + dy
n = (SNAKE_LENGTH + 4) / 2
score = get_score(x, y, n)
# print 'Score for', move, '=', score
# Suicide protection squad!
try:
square = get_cell(BOARD, x, y)
except KeyError:
continue
else:
if square not in (APPLE_TILE, EMPTY_TILE):
continue
if score == max_score:
max_moves.append(move)
elif max_score is None or score > max_score:
max_score = score
max_moves = [move]
if max_moves:
print random.choice(max_moves)
else:
raise Exception, "No suitable moves found!"
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