text: def resolve():
      '''
      code here
      '''
      sx, sy, tx, ty = [int(item) for item in input().split()]
  
      gx = tx - sx
      gy = ty - sy
  
      def r(num):
          return 'R'*num
      
      def l(num):
          return 'L'*num
      
      def u(num):
          return 'U'*num
  
      def d(num):
          return 'D'*num
  
      first_trail = l(1) + u(gy+1) + r(gx+1) + d(gy+1) + l(gx)
      second_trail = u(gy) + r(gx+1) + d(gy+1) + l(gx+1) + u(1)
  
      print(first_trail + second_trail)
  
  
  if __name__ == "__main__":
      resolve()
  