package main

import . "fmt"
import . "strings"

func main() {
	var h,w int
	Scan(&h,&w)
	s := Repeat("OOXX", w)
	t := s[2:]
	s = s[:w]
	t = t[:w]
	for ; h > 0 ; h-- {
		Println(s)
		s, t = t, s
	}
}