#include<stdio.h>
#define tip long long
tip L,a,n,k,N[110][110],A[110][110],AT[110],NT[110],LC,x,CC;
void read(),solve();
int main()
{
	read();
	solve();
	return 0;
}
void read()
{
	freopen("pavare2.in","r",stdin);
	freopen("pavare2.out","w",stdout);
	scanf("%lld%lld%lld",&L,&a,&n);
	scanf("%lld",&k);
}
void solve()
{
	for(LC=1;LC<=L;LC++)
	{
		for(x=1;x<=a;x++)
		{
			if(x>LC)A[LC][x]=0;
			else
			if(x==LC)A[LC][x]=1;
			else
			if(x==1)A[LC][x]=NT[LC-1];
			else
			A[LC][x]=A[LC-1][x-1];
			AT[LC]+=A[LC][x];
		}
		for(x=1;x<=n;x++)
		{
			if(x>LC)N[LC][x]=0;
			else
			if(x==LC)N[LC][x]=1;
			else
			if(x==1)N[LC][x]=AT[LC-1];
			else
			N[LC][x]=N[LC-1][x-1];
			NT[LC]+=N[LC][x];
		}
	}
	printf("%lld\n",NT[L]+AT[L]);
	LC=L;
	if(AT[L]<k){k-=AT[L];CC=1;}
	for(;;)
	{
		if(CC==0)
		{
			for(x=a;;x--)
			{
				if(A[LC][x]<k)k-=A[LC][x];
				else break;
			}
			LC-=x;CC=1;
			for(;x;x--)printf("0");
		}
		else
		{
			for(x=1;;x++)
			{
				if(N[LC][x]<k)k-=N[LC][x];
				else break;
			}
			LC-=x;CC=0;
			for(;x;x--)printf("1");
		}
		if(!LC)break;
	}
}