#include <bits/stdc++.h>
 
using namespace std;
 
#define int long long
 
int between(int a,int b,int n)
{
    int ret=0;
    while(a<n)
    {
        a*=10,b*=10;
        ret+=max(0ll,min(n+1,b)-a);
    }
    return ret;
}
 
main()
{
    int n,k;
    cin>>n>>k;
    int c_ord=1;
    int c_num=1;
    while(c_ord<k)
    {
        int n_ord=c_ord+1+between(c_num,c_num+1,n);
        if(n_ord<=k)
        {
            c_num++;
            c_ord=n_ord;
        }
        else
        {
            c_num*=10;
            c_ord++;
        }
    }
    cout<<c_num<<endl;
}
 

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