# https://yukicoder.me/problems/no/3802


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

    passed = [[False] * W for _ in range(H)]
    for h in range(H):
        for w in range(W):
            if S[h][w] == ".":

                new_w0 = w - 1
                new_w1 = w + 1
                if (not (0 <= new_w0 < W) or S[h][new_w0] == "#") and (0 <= new_w1 < W and S[h][new_w1] == "."):
                    passed[h][w] = True

                new_h0 = h - 1
                new_h1 = h + 1
                if (not (0 <= new_h0 < H) or S[new_h0][w] == "#") and (0 <= new_h1 < H and S[new_h1][w] == "."):
                    passed[h][w] = True


    answers = []
    for h in range(H):
        for w in range(W):
            if passed[h][w]:
                answers.append((h + 1, w + 1))

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






if __name__ == "__main__":
    main()