package main

import (
	"bufio"
	"os"
	"strconv"
	"fmt"
)

var s = bufio.NewScanner(os.Stdin)

func next() string {

	s.Split(bufio.ScanWords)
	s.Scan()
	return s.Text()
}
func nextLine() string {
	s.Split(bufio.ScanLines)
	s.Scan()
	if nil != s.Err() {
		panic(s.Err())
	}
	return s.Text()
}

func nextInt() int {
	i, e := strconv.Atoi(next())
	if e != nil {
		panic(e)
	}
	return i
}

func max(a int, b int) int {
	if a < b {
		return b
	}
	return a
}


func solve(S []string, x int, y int) bool {
	if y == 0 && x <= 0 {
		return false
	}
	checked := make([][]bool, H)
	for i := 0; i < len(S); i++ {
		checked[i] = make([]bool, W)
	}
	count := 0
	for j := 0; j < H; j++ {
		for i := 0; i < W; i++ {
			if checked[j][i] || S[j][i] == '.' {
				continue
			}
			if 0 <= i+x && i+x < W && 0 <= j+y && j+y < H {
				if checked[j + y][i + x] {
					return false
				}
				if S[j+y][i+x] == '.' {
					return false
				}

				checked[j][i] = true
				checked[j+y][i+x] = true
				count++

			}else {
				return false
			}
		}
	}
	if count > 0 {
		println(count, x, y)
		return true
	}

	return false
}

var H int
var W int

func main() {

	H = nextInt()
	W = nextInt()


	S := make([]string, H)
	for i := 0; i < H; i++ {
		S[i] = nextLine()
	}



	for i := -W + 1; i < W; i++ {
		for j := 0; j < H; j++ {
			if solve(S, i, j) {
				fmt.Println("YES")
				return
			}
		}
	}

	fmt.Println("NO")



}