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

ans = []
for i in range(H):
    for j in range(W):
        if S[i][j] == "#": continue
        if (i+1 < H and S[i+1][j] == "." and (i == 0 or S[i-1][j] == "#") or
            j+1 < W and S[i][j+1] == "." and (j == 0 or S[i][j-1] == "#")):
            ans.append((i+1, j+1))

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