2025/04/a.py


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import fileinput

def neigh(a, i, j):
	return [
		a[i-1][j-1], a[i-1][j], a[i-1][j+1],
		a[i][j-1],              a[i][j+1],
		a[i+1][j-1], a[i+1][j], a[i+1][j+1],
	].count('@')

with fileinput.input() as lines:
	a = [
		['.'] * 200,
		*[['.'] + list(line.replace('\n', '.')) for line in lines],
		['.'] * 200,
	]

s = 0
for i in range(1,len(a)-1):
	for j in range(1,len(a[1])-1):
		if a[i][j] == '@' and neigh(a, i, j) < 4:
			s += 1
print(s)