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

class String
{
private:
    int n;
    char *car;
public:
    String()
    {
        n=20;
        car=new char[n];
    }
    String(int d)
    {
        n=d;
        car=new char[d];
    }

    String(char sir[])
    {
        int cnt=0;
        for(int i=0;sir[i]!=0;i++)
            cnt++;
        n = cnt;
        car=new char[n];

        for(int i=0;i<n;i++)
            car[i] = sir[i];
    }
    int Dim()
    {
        return n;
    }
    char Lit(int poz)
    {
        return car[poz-1];
    }
    friend ostream& operator <<(ostream& out, String& st)
    {
        for(int i=0;i<n;i++)
            out<<car[i];
        out<<"\n";
        return out;
    }
};

int main()
{
    String str("casa");

    cout<<str;
    return 0;
}