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] != ".":
            continue

        vertical = (h == 0 or S[h-1][w] == "#") and h != H-1 and S[h+1][w] == "."
        horizontal = (w == 0 or S[h][w-1] == "#") and w != W-1 and S[h][w+1] == "."

        if vertical or horizontal:
            ans.append((h, w))

print(len(ans))
for h, w in ans:
    print(h, w)