// editor5
#include<stdio.h>
#include<stdlib.h>
struct node
{
    int data;
    struct node*next;
}
*head=NULL,*tail;
int main()
{
    int o,v,flag=0;
    scanf("%d%d",&o,&v)
    struct node*temp=head;
    while(temp)
    {
        if(temp->data==0)
        {
            temp->data=v;
            flag=i
            temp=temp->next;
        }
    }
    if(flag==0)
    printf("Value not found");
    else
    while(head)
    {
        printf("%d",head->data);
        head=head->next;
    }
}