#include <iostream>

int main() {
    int n;
    std::cin >> n;
    int ik, jk, ie, je;
    std::cin >> ik >> jk >> ie >> je;
    char vertical_move = jk > je ? 'U' : 'L';
    char horizontal_move = ik > ie ? 'L' : 'R';
    int dv = std::abs(ik - ie);
    if (dv % 2 != 0) {
        std::cout << "Impossible" << std::endl;
        return 0;
    }
    int nvmoves = dv / 2;
    int dh = std::abs(jk - je);
    if (not dh) {
        if (dv % 2 == 0) {
            std::cout << nvmoves << std::endl;
            for (int i = 0; i != nvmoves; ++i) {
                std::cout << vertical_move << (i % 2 ? 'L' : 'R') << ' ';
            }
        }
        return 0;
    }
    dh = std::abs(dh - nvmoves);
    if (dh % 2 != 0) {
        std::cout << "Impossible" << std::endl;
        return 0;
    }
    int nhmoves = dh / 2;
    std::cout << nvmoves + nhmoves << std::endl;
    for (int i = 0; i != nvmoves; ++i) {
        std::cout << vertical_move << horizontal_move << ' ';
    }
    for (int i = 0; i != nhmoves; ++i) {
        std::cout << horizontal_move << ' ';
    }
    return 0;
}