//go:build ignore

// 组合的输出 从 n 个元素(1-n)中选取 r 个数
package main

import "fmt"

var (
	n    int
	r    int
	path []int
)

func dfs(x int) {
	// Return
	if len(path) >= r {
		for _, v := range path {
			fmt.Printf("%d ", v)
		}
		fmt.Printf("\n")
		return
	}
	// Traverse
	for i := x; i <= n; i++ {
		path = append(path, i)
		dfs(i + 1)
		path = path[:len(path)-1]
	}
}

func main() {
	fmt.Scan(&n, &r)
	dfs(1)
}