250119

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dir = [(0, 1), (1, 0), (-1, 0), (0, -1)]
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def dfs(x, y):
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  global area
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  area += 1
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  vis[x][y] = True
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  for dx, dy in dir:
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    tx, ty = x+dx, y+dy
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    if 0 <= tx <= n -1 and 0 <= ty <= n-1 and a[tx][ty] == '#' and not vis[tx][ty]:
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      dfs(tx, ty)