```go
package main

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

func main() {
	var n, k int
	fmt.Scan(&n, &k)
	grid := make([]string, n)
	scanner := bufio.NewScanner(os.Stdin)
	for i := 0; i < n; i++ {
		scanner.Scan()
		grid[i] = scanner.Text()
	}
	count := make([][]int, n)
	for i := 0; i < n; i++ {
		count[i] = make([]int, n)
	}
	// horizontal
	for r := 0; r < n; r++ {
		for s := 0; s <= n-k; s++ {
			valid := true
			for j := 0; j < k; j++ {
				if grid[r][s+j] == '#' {
					valid = false
					break
				}
			}
			if valid {
				for j := 0; j < k; j++ {
					count[r][s+j]++
				}
			}
		}
	}
	// vertical, only if k>1
	if k > 1 {
		for c := 0; c < n; c++ {
			for s := 0; s <= n-k; s++ {
				valid := true
				for j := 0; j < k; j++ {
					if grid[s+j][c] == '#' {
						valid = false
						break
					}
				}
				if valid {
					for j := 0; j < k; j++ {
						count[s+j][c]++
					}
				}
			}
		}
	}
	// find max
	maxVal := 0
	bestr := 0
	bestc := 0
	for i := 0; i < n; i++ {
		for j := 0; j < n; j++ {
			if count[i][j] > maxVal {
				maxVal = count[i][j]
				bestr = i
				bestc = j
			}
		}
	}
	fmt.Println(bestr+1, bestc+1)
}
```