#include<iostream>

using namespace std;


int main(){

        int a, b;
        int k = 0;
        cout << "INPUT SIZE 1: ";
        cin >> a;
        cout << "INPUT SIZE 2: ";
        cin >> b;

        if(a >= 20 || b >= 20){
            cout << "Size >= 20 ! is err";
            return 0;
        }

        if(a == b){
            cout << "Size 1 == size 2 ! is err";
            return 0;
        }

        if(a > b){
            k = (a - b) / 2;
        }

        if(a < b){
            k = (b - a) / 2;
        }

        char arr[20][20] = {0};

        for(int i=0; i<a; i++){
            arr[i][0] = '*';
            arr[0][i] = '*';
            arr[a-1][i] = '*';
            arr[i][a-1] = '*';
        }

        b += k;
        for(int i=k; i<b; i++){
            arr[i][k] = '*';
            arr[k][i] = '*';
            arr[b-1][i] = '*';
            arr[i][b-1] = '*';
        }

        for(int i=0;i<20;i++){
           for(int j=0;j<20;j++){
                cout << arr[i][j];
           }
           cout << endl;
        }

        getchar();
        return 0;
    }