local a, b = io.read("*n", "*n")
local c, d = io.read("*n", "*n")
a = c - a
b = d - b
for i = 1, a do
  io.write("R")
end
for i = 1, b do
  io.write("U")
end
for i = 1, a do
  io.write("L")
end
for i = 1, b do
  io.write("D")
end
io.write("D")
for i = 1, a + 1 do
  io.write("R")
end
for i = 1, b + 1 do
  io.write("U")
end
io.write("LU")
for i = 1, a + 1 do
  io.write("L")
end
for i = 1, b + 1 do
  io.write("D")
end
print("R")
