t = int(raw_input())
#matrix = [[0 for i in range(t)] for j in range(t)]
inp = map(int, raw_input().strip().split())
si,sj = inp[0],inp[1]
ei,ej = inp[2],inp[3]
j,i = sj,si
arr = []
path = 0

for k in range(0,250,1):
    if ei <= i and ej <= j:
        i = i - 2
        j = j - 1
        arr.append('UL')
        path = path + 1
        if ei == i  and ej == j:
            print path
            print ' '.join(map(str,arr))
            break
        if ei == i:
            for l in range(0,j/2,1):
                j = j - 2
                path = path + 1
                arr.append('L')
                if i == ei and j == ej:
                    print path
                    print ' '.join(map(str,arr))
            break
    if ei <= i and ej >= j:
        i = i - 2
        j = j + 1
        arr.append('UR')
        path = path + 1
        if ei == i  and ej == j:
            print path
            print ' '.join(map(str,arr))
            break
        if ei == i:
            for l in range(0,j/2,1):
                j = j + 2
                path = path + 1
                arr.append('R')
                if i == ei and j == ej:
                    print path
                    print ' '.join(map(str,arr))
            break
    
    if ei >= i and ej >= j:
        i = i + 2
        j = j + 1
        arr.append('LR')
        path = path + 1
        if ei == i  and ej == j:
            print path
            print ' '.join(map(str,arr))
            break
        if ei == i:
            for l in range(0,j/2,1):
                j = j - 2
                path = path + 1
                arr.append('L')
                if i == ei and j == ej:
                    print path
                    print ' '.join(map(str,arr))
            break
    if ei >= i and ej <= j:
        i = i + 2
        j = j - 1
        arr.append('LL')
        path = path + 1
        if ei == i  and ej == j:
            print path
            print ' '.join(map(str,arr))
            break
        if ei == i:
            for l in range(0,j/2,1):
                j = j - 2
                path = path + 1
                arr.append('L')
                if i == ei and j == ej:
                    print path
                    print ' '.join(map(str,arr))
            break
if si % 2 == 0:
    for l in range(1,t,2):
        if ei == l:
            print 'Impossible'
if si % 2 == 1:
    for l in range(0,t,2):
        if ei == l:
            print 'Impossible' 
            

if si % 2 == 0:
    for j in range(0,t,2):
        for i in range(0,t,4):
            if ei == i and ej == j:
                print 'Impossible'
    for j in range(1,t,2):
        for i in range(2,t,4):
            if ei == i and ej == j:
                print 'Impossible'