package main
import "fmt"

func main() {
 //Enter your code here. Read input from STDIN. Print output to STDOUT
    var n,ky,kx,ey,ex,dy,dx int
    fmt.Scan(&n)
    fmt.Scan(&ky,&kx)
    fmt.Scan(&ey,&ex)
    dy = ky-ey
    dx = kx-ex
    
    if dy % 2 == 1 {
        fmt.Println("Impossible")
        return
    }
    moves := []string{}
    
    for dy != 0 || dx != 0 {
        if dy == 0 {
            if dx < 0 {
                moves = append(moves,"R")
                kx += 2
            } else if dx > 0 {
                moves = append(moves,"L")
                kx -=2
            }
        } else if dy > 0 {
            if dx < 0 {
                moves = append(moves,"UR")
                kx++
                ky -= 2
            } else {
                moves = append(moves,"UL")
                kx--
                ky -= 2
            }
        } else {
            if dx > 0 {
                moves = append(moves,"LL")
                kx--
                ky += 2
            } else {
                moves = append(moves,"LR")
                kx++
                ky += 2
            }
        }
        
        dy = ky-ey
        dx = kx-ex
        //fmt.Println(moves[len(moves)-1],dy,dx)
    }
    fmt.Println(len(moves))
    for _,i := range moves {
        fmt.Print(i," ")
    }
    
}