#include<fstream>
using namespace std;
#define max 100001
int n,*a[max],d[max],s;
void read()
{
	int m,i,j;
	ifstream fin("bfs.in");
	fin>>n>>m>>s;
	for(int i=1;i<=n;i++)
		{
			a[i]=new int[n+1];
			d[i]=-1;
		}
	for(;m;--m)
	{
		fin>>i>>j;
		a[i][j]=1;
	}
	fin.close();
}
void bfs()
{
	int *coada=new int [n+1],st=1,dr=1,i,k;
	coada[1]=s;
	d[s]=0;
	while(st<=dr)
	{
		k=coada[st];
		for(i=1;i<=n;i++)
			if(a[k][i]==1&&d[i]==-1)
				{
					coada[++dr]=1;
					d[i]=d[k]+1;
				}
		st++;		
	}
}
void write()
{
	ofstream fout("bfs.out");
	for(int i=1;i<=n;i++)
		fout<<d[i];
	fout.close();
}
int main()
{
	read();
	bfs();
	write();
	return 0;
}