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

#define rep(i,x,y) for(int i=(x);i<(y);++i)
#define debug(x) #x << "=" << (x)

#ifdef DEBUG
#define _GLIBCXX_DEBUG
#define dump(x) std::cerr << debug(x) << " (L:" << __LINE__ << ")" << std::endl
#else
#define dump(x)
#endif

typedef long long int ll;
typedef pair<int,int> pii;
//template<typename T> using vec=std::vector<T>;

const int inf=1<<30;
const long long int infll=1LL<<58;
const double eps=1e-9;
const int dx[]={1,0,-1,0},dy[]={0,1,0,-1};

template <typename T> ostream &operator<<(ostream &os, const vector<T> &vec){
    os << "[";
    for (const auto &v : vec) {
    	os << v << ",";
    }
    os << "]";
    return os;
}

void solve(){
    while(true){
        ll n,k;
        cin >> n >> k;
        if(n==0 and k==0) break;

        ll x,y;
        rep(i,1,inf){
            ll tmp=i*(pow(10,i)-pow(10,i-1));
            if(n-tmp>0) n-=tmp;
            else{
                x=pow(10,i-1);
                y=i;
                break;
            }
        }
        dump(x);
        dump(y);
        dump(n);

        ll z=0;
        rep(i,1,11){
            if(n-y*x>0) n-=y*x;
            else{
                z=i;
                break;
            }
        }
        dump(z);
        dump(n);
        ll w=0;
        rep(i,1,11){
            if(n-y*x/10>0) n-=y*x/10;
            else{
                w=i-1;
                break;
            }
        }
        dump(w);
        dump(n);
        ll hoge=0;
        rep(i,1,11){
            if(n-y*x/100>0) n-=y*x/100;
            else{
                hoge=i-1;
                break;
            }
        }
        dump(hoge);
        ll piyo=0;
        rep(i,1,11){
            if(n-y*x/1000>0) n-=y*x/1000;
            else{
                piyo=i-1;
                break;
            }
        }
        dump(piyo);
        dump(n);
        stringstream ss;
        rep(i,0,100000){
            ss << x*z+x*w/10+x*hoge/100+x*piyo/1000+i;
            //dump(ss.str().size());
            if(ss.str().size()>n+k) break;
        }
        cout << ss.str().substr(n-1,k) << endl;
    }
}

int main(){
    std::ios::sync_with_stdio(false);
    std::cin.tie(0);
    cout << fixed << setprecision(8);
    solve();
    return 0;
}