import random

def random_bot(board, (x, y)):
    height = len(board)
    width = len(board[0])
    moves = []
    if x > 0:
        moves.append('L')
    if x < width - 1:
        moves.append('R')
    if y > 0:
        moves.append('U')
    if y < height - 1:
        moves.append('D')
    return random.choice(moves)