#!/bin/ruby

def printShortestPath(n, i_start, j_start, i_end, j_end)
    if (i_start%2 != i_end%2)
        print "Impossible"
    elsif (j_start == j_end)
        if i_start > i_end
            index = (i_start - i_end)/2
            puts index
            (index/2).times {print "UL UR "}
        else
            index = -(i_start - i_end)/2
            puts index
            (index/2).times {print "LR LL "}
        end
    elsif (i_start == i_end)
        if j_start > j_end
            index = (j_start - j_end)/2
            puts index
            index.times {print "L "}
        else
            index = -(j_start - j_end)/2
            puts index
            index.times {print "R "}
        end
    elsif (i_start > i_end)
        if (j_start > j_end)
            index1 = (i_start - i_end)/2
            index2 = ((j_start - j_end) - index1)/2
            index = index1 + index2
            puts index
            index1.times {print "UL "}
            index2.times {print "L "}
        elsif (j_start < j_end)
            index1 = (i_start - i_end)/2
            index2 = (-(j_start - j_end) - index1)/2
            index = index1 + index2
            puts index
            index1.times {print "UR "}
            index2.times {print "R "}
        end
    elsif (i_start < i_end)
        if (j_start > j_end)
            index1 = -(i_start - i_end)/2
            index2 = ((j_start - j_end) - index1)/2
            index = index1 + index2
            puts index
            index1.times {print "LL "}
            index2.times {print "L "}
        elsif (j_start < j_end)
            index1 = -(i_start - i_end)/2
            index2 = (-(j_start - j_end) - index1)/2
            index = index1 + index2
            puts index
            index1.times {print "LR "}
            index2.times {print "R "}
        end
    end
end

n = gets.strip.to_i
i_start, j_start, i_end, j_end = gets.strip.split(' ')
i_start = i_start.to_i
j_start = j_start.to_i
i_end = i_end.to_i
j_end = j_end.to_i
printShortestPath(n, i_start, j_start, i_end, j_end)