#include <bits/stdc++.h>   using namespace std;   int a[107], b[107];   int main() {     int m, s;     cin >> m >> s;     int ss = s;     if (s >= 2 and s <= m * 9) {       s--;       a[m] = 1;       for (int i = 1; i <= m; i++) {         if (s > 9) {           a[i] += 9;           s -= 9;         } else {           a[i] += s;           break;         }       }       for (int i = m; i > 0; i--) {         cout << a[i];       }       cout <<    ;       for (int i = m; i > 0; i--) {         if (ss > 9) {           b[i] = 9;           ss -= 9;         } else {           b[i] += ss;           break;         }       }       for (int i = m; i > 0; i--) {         cout << b[i];       }     } else {       if (s == 1) {         cout << 1;         for (int i = 1; i < m; i++) {           cout << 0;         }         cout <<    ;         cout << 1;         for (int i = 1; i < m; i++) {           cout << 0;         }       } else {         if (m == 1 and s == 0) {           cout << 0 <<     << 0;         } else {           cout << -1 <<     << -1;         }       }     }   }   