自认为代码还比较简单，没有很多变量，纯贪心

#include<bits/stdc++.h>

using namespace std;

int m,sum;

void solve1(int sum,int m){
    if(sum<=(m-1)*9){
        cout<<1;
        sum--;
    }
    else{
        cout<<sum-(m-1)*9;
        sum-=sum-(m-1)*9;
    }
    m--;
    while(m--){
        int t=sum-m*9;
        if(t<0) t=0;
        cout<<t;
        sum-=t;
    }
    cout<<" ";
}

void solve2(int sum,int m){
    while(m--){
        if(sum>=9){
            cout<<9;
            sum-=9;
        }
        else{
            cout<<sum;
            sum=0;
        }
    }
}

int main(){
    cin>>m>>sum;
    if(m==1 && sum==0){
        cout<<0<<" "<<0<<endl;
        return 0;
    }
    if(sum>m*9 || sum==0){
        cout<<-1<<" "<<-1<<endl;
        return 0;
    }
    solve1(sum,m);
    solve2(sum,m);
    return 0;
}