#!/usr/bin/env python
# 2025 - Advent Of Code 4

# file = 'input_example.txt'
file = 'input.txt'

# pylint: disable=consider-using-with
input_lines = [line.strip('\n') for line in open(file, encoding="utf-8")]
MAX_X = len(input_lines[0])
MAX_Y = len(input_lines)

accessible = 0
for pos_y in range(0, MAX_Y):
    for pos_x in range(0, MAX_X):
        if input_lines[pos_y][pos_x] == '@':
            rolls = 0
            if pos_y > 0 and pos_x > 0 and input_lines[pos_y-1][pos_x-1] == '@':
                rolls += 1
            if pos_y > 0 and input_lines[pos_y-1][pos_x] == '@':
                rolls += 1
            if pos_y > 0 and pos_x < MAX_X - 1 and input_lines[pos_y-1][pos_x+1] == '@':
                rolls += 1
            if pos_x > 0 and input_lines[pos_y][pos_x-1] == '@':
                rolls += 1
            if pos_x < MAX_X - 1 and input_lines[pos_y][pos_x+1] == '@':
                rolls += 1
            if pos_y < MAX_Y - 1 and pos_x > 0 and input_lines[pos_y+1][pos_x-1] == '@':
                rolls += 1
            if pos_y < MAX_Y - 1 and input_lines[pos_y+1][pos_x] == '@':
                rolls += 1
            if pos_y < MAX_Y - 1 and pos_x < MAX_X - 1 and input_lines[pos_y+1][pos_x+1] == '@':
                rolls += 1

            if rolls < 4:
                accessible += 1
                print('x', end='')
            else:
                print('@', end='')
        else:
            print('.', end='')
    print()

print(accessible)