/**

public static void bfs(byte [][] a,int vertices,int source){ //passing adjacency matrix and no of vertices

byte []b=new byte[vertices]; //flag container containing status of each vertices

Arrays.fill(b,(byte)-1); //status initialization

/* code status

Queue <Integer> st=new Queue<>(); //operational stack

st.add(source); //assigning source

while(!st.isEmpty()){

b[st.peek()]=(byte)0; //assigning waiting status

System.out.println(st.element());

int pop=st.element();

b[pop]=(byte)1; //assigning processed status

st.remove(); //removing head of the queue

for(int i=0;i<vertices;i++){

if(a[pop][i]!=0 && b[i]!=(byte)0 && b[i]!=(byte)1 ){

st.add(i);

b[i]=(byte)0; //assigning waiting status

}}}

}

/**

public static void main(String args[]){

Scanner in=new Scanner(System.in);

int vertices=in.nextInt(),source=in.nextInt();

byte [][]a=new byte [vertices][vertices];

//initially all elements of a are initialized with value zero

for(int i=0;i<vertices;i++){

int size =in.nextInt();

for(int j=0;j<size;j++){

a[i][in.nextInt()]=1; //taking adjacency entries by assigning 1

}

}

bfs(a,vertices,source); //function call