#include<bits/stdc++.h>
using namespace std;

#define int long long
typedef vector<int>vint;
typedef pair<int,int>pint;
typedef vector<pint>vpint;
#define rep(i,n) for(int i=0;i<(n);i++)
#define reps(i,f,n) for(int i=(f);i<(n);i++)
#define all(v) (v).begin(),(v).end()
#define each(it,v) for(__typeof((v).begin()) it=(v).begin();it!=(v).end();it++)
#define pb push_back
#define fi first
#define se second
template<typename A,typename B>inline void chmin(A &a,B b){if(a>b)a=b;}
template<typename A,typename B>inline void chmax(A &a,B b){if(a<b)a=b;}

int N,K;

void solve(){
    N--;
    int d=1,t=1;
    while(true){
        if(N<t*9*d)break;
        N-=t*9*d;
        d++;
        t*=10;
    }

    int tmp=N/d;
    N%=d;
    t+=tmp;
    stringstream ss;
    while(ss.str().size()<120){
        ss<<t;
        t++;
    }
    string s=ss.str();
    cout<<s.substr(N,K)<<endl;

}

signed main(){
    while(cin>>N>>K,N||K)solve();
    return 0;
}