H, W = map(int, input().split())
S = [input() for _ in range(H)]

ans = []

for h in range(H):
    for w in range(W):
        if (
            S[h][w] == "."
            and (h == 0 or S[h-1][w] == "#")
            and h != H-1
            and S[h+1][w] == "."
        ) or (
            S[h][w] == "."
            and (w == 0 or S[h][w-1] == "#")
            and w != W-1
            and S[h][w+1] == "."
        ):
            ans.append((h, w))

print(len(ans))
for i, j in ans:
    print(i, j)