import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.NoSuchElementException;

public class Main{
	static FastScanner sc = new FastScanner();
	static PrintWriter out = new PrintWriter(System.out);
	static String S;
	static int n;
	static boolean seen [][];
	static int field [][];
	
	public static void main(String[] args) {
		int sx = sc.nextInt()+1001;
		int sy = sc.nextInt()+1001;
		int tx = sc.nextInt()+1001;
		int ty = sc.nextInt()+1001;
		
		int cx = sx;
		int cy = sy;
		seen = new boolean [2003][2003];
		
		while (cx!=tx || cy!=ty) {
			cy++;
			seen[cx][cy]=true;
			out.print("U");
			
			if (cx==tx-1) {
				while (cy!=ty) {
					cy++;
					seen[cx][cy]=true;
					out.print("U");
				}
				
				if(cy==ty) {
					cx++;
					out.print("R");
				}
			}
			
			else {
				while (cx!=tx-1) {
					cx++;
					seen[cx][cy]=true;
					out.print("R");
				}
			}
		}
		
		while (cx!=sx || cy!=sy) {
			while (cy!=sy) {
				cy--;
				seen[cx][cy]=true;
				out.print("D");
			}
			
			while (cx!=sx) {
				cx--;
				seen[cx][cy]=true;
				out.print("L");
			}
		}
		
		seen[cx][cy]=false;
		cx--;
		seen[cx][cy]=true;
		out.print("L");
		
		while (cx!=tx) {
			cy++;
			seen[cx][cy]=true;
			out.print("U");
			
			if (seen[cx+1][cy])
				continue;
			
			while (!seen[cx+1][cy] && cx<tx) {
				cx++;
				seen[cx][cy]=true;
				out.print("R");
			}
		}
		
		out.print("DR");
		cx=tx+1;
		cy=ty;
		
		while (cx!=sx) {
			cy--;
			seen[cx][cy]=true;
			out.print("D");
			
			if (seen[cx-1][cy])
				continue;
			
			while (!seen[cx-1][cy] && cx>sx) {
				cx--;
				seen[cx][cy]=true;
				out.print("L");
			}
		}
		
		out.print("U");
		
		out.flush();
	}
	
	
	
		static class FastScanner {
		    private final InputStream in = System.in;
		    private final byte[] buffer = new byte[1024];
		    private int ptr = 0;
		    private int buflen = 0;

		    private boolean hasNextByte() {
		      if (ptr < buflen) {
		        return true;
		      } else {
		        ptr = 0;
		        try {
		          buflen = in.read(buffer);
		        } catch (IOException e) {
		          e.printStackTrace();
		        }
		        if (buflen <= 0) {
		          return false;
		        }
		      }
		      return true;
		    }

		    private int readByte() {
		      if (hasNextByte()) return buffer[ptr++];
		      else return -1;
		    }

		    private static boolean isPrintableChar(int c) {
		      return 33 <= c && c <= 126;
		    }

		    private void skipUnprintable() {
		      while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;
		    }

		    public boolean hasNext() {
		      skipUnprintable();
		      return hasNextByte();
		    }

		    public String next() {
		      if (!hasNext()) throw new NoSuchElementException();
		      StringBuilder sb = new StringBuilder();
		      int b = readByte();
		      while (isPrintableChar(b)) {
		        sb.appendCodePoint(b);
		        b = readByte();
		      }
		      return sb.toString();
		    }

		    public long nextLong() {
		      if (!hasNext()) throw new NoSuchElementException();
		      long n = 0;
		      boolean minus = false;
		      int b = readByte();
		      if (b == '-') {
		        minus = true;
		        b = readByte();
		      }
		      if (b < '0' || '9' < b) {
		        throw new NumberFormatException();
		      }
		      while (true) {
		        if ('0' <= b && b <= '9') {
		          n *= 10;
		          n += b - '0';
		        } else if (b == -1 || !isPrintableChar(b)) {
		          return minus ? -n : n;
		        } else {
		          throw new NumberFormatException();
		        }
		        b = readByte();
		      }
		    }

		    public int nextInt() {
		      return (int) nextLong();
		    }
		    
		    public double nextDouble(){
		    	return Double.parseDouble(next());
		    }

		    public int[] nextIntArray(int N, boolean oneBased) {
		      if (oneBased) {
		        int[] array = new int[N + 1];
		        for (int i = 1; i <= N; i++) {
		          array[i] = sc.nextInt();
		        }
		        return array;
		      } else {
		        int[] array = new int[N];
		        for (int i = 0; i < N; i++) {
		          array[i] = sc.nextInt();
		        }
		        return array;
		      }
		    }

		    public long[] nextLongArray(int N, boolean oneBased) {
		      if (oneBased) {
		        long[] array = new long[N + 1];
		        for (int i = 1; i <= N; i++) {
		          array[i] = sc.nextLong();
		        }
		        return array;
		      } else {
		        long[] array = new long[N];
		        for (int i = 0; i < N; i++) {
		          array[i] = sc.nextLong();
		        }
		        return array;
		      }
		    }
		  }

		}	 





Measured memory_bytes: 25300