#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")

char*mmap();
#define RD(v) int v=0;{int _c;while(_c=*rp++-48,_c>=0)v=v*10+_c;}

#define WT(v) {int _z=v,_n=0;long _d=0;while(++_n,_d=_d<<8|0x30|_z%10,_z/=10);*(long*)wp=_d;wp+=_n;}

static inline
int max(int a,int b){
	return a>b?a:b;
}

void locate(int s,int*px,int*py){
	int r=(int)sqrt(s-1)+1&~1;
	int r1=r>>1;
	int t=(r+1)*(r+1)-s;
	if(t<r){
		*px=r1-t;
		*py=r1;
	}else if(t-=r,t<r){
		*px=-r1;
		*py=r1-t;
	}else if(t-=r,t<r){
		*px=-r1+t;
		*py=-r1;
	}else if(t-=r,1){
		*px=r1;
		*py=-r1+t;
	}
}

int numat(int x,int y){
	int r1=max(abs(x),abs(y));
	int r=r1<<1;
	int t=r1==y?-x:r1==-x?r-y:r1==-y?r*2+x:r*3+y;
	return (r+1)*(r+1)-r1-t;
}

int vvs[33];
int cvs[200008];
char cpre[200008],wbuf[200040],*wp=wbuf;
int cpren;

int f1(int ox,int oy,int zx,int zy,int av){
	int ov=numat(ox,oy);
	while(!(ox==zx&&oy==zy)){
		int c;
		if(ox<zx){
			++ox;
			c=3;
		}else if(ox>zx){
			--ox;
			c=2;
		}else if(oy<zy){
			++oy;
			c=1;
		}else{
			--oy;
			c=0;
		}
		cpre[cpren]=c;
		int nv=numat(ox,oy);
		int vv=ov^nv;
		cvs[cpren]=vv;
		cpren++;
		int bw=31-__builtin_clz(vv);
		vvs[bw]=vv;
		av^=ov=nv;
	}
	return av;
}

int f2(int i,int n,int fv){
	for(;i<n;++i){
		*wp++="UDLR"[cpre[i]];
		int vv=cvs[i];
		int bw=31-__builtin_clz(vv);
		if(fv&1<<bw&&vv==vvs[bw]){
			*wp++="DURL"[cpre[i]];
			*wp++="UDLR"[cpre[i]];
			fv&=~(1<<bw);
		}
	}
	return fv;
}

main(){
	char*rp=mmap(0l,1l<<28,1,2,0,0ll);
	RD(s);
	RD(t);
	int sx,sy,tx,ty;
	locate(s,&sx,&sy);
	locate(t,&tx,&ty);

	int av=s;
	av=f1(sx,sy,0,0,av);
	int cprenhalf=cpren;
	av=f1(0,0,tx,ty,av);
	int k=abs(sx)+abs(sy)+abs(tx)+abs(ty);

	int fv=0,lv=0;
	for(int iv=1<<30;iv>=32;iv>>=1){
		if(av&iv){
			fv|=iv;
			av^=vvs[31-__builtin_clz(iv)];
			k+=2;
		}
	}
	if(av&16){
		lv|=16;
		av^=19^1; // 1 -> 1,6,19,6,1
		k+=4;
	}
	if(av&8){
		lv|=8;
		av^=8^1; // 1 -> 1,8,1
		k+=2;
	}
	if(av&4){
		lv|=4;
		av^=4^1; // 1 -> 1,4,1
		k+=2;
	}
	if(av&2){
		lv|=2;
		av^=2^1; // 1 -> 1,8,1
		k+=2;
	}
	if(av&1){
		lv|=1;
		av^=1; // 1 -> 1,2,3,2,1,2,1
		k+=6;
	}
	*wp++='0';
	*wp++='\n';
	WT(k);
	*wp++='\n';
	fv=f2(0,cprenhalf,fv);
	if(lv&16) *wp++='L',*wp++='L',*wp++='R',*wp++='R';
	if(lv&8) *wp++='D',*wp++='U';
	if(lv&4) *wp++='U',*wp++='D';
	if(lv&2) *wp++='R',*wp++='L';
	if(lv&1) *wp++='R',*wp++='U',*wp++='D',*wp++='L',*wp++='R',*wp++='L';
	fv=f2(cprenhalf,cpren,fv);
	*wp++=10;
	write(1,wbuf,wp-wbuf);
	_exit(0);
}