caius iac SB2 with std::string

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

string read() {
    string s;
    char ch;
    do {
        ch = getch();
        if (!isdigit(ch)) {
            break;
        }
        s += ch;
    } while(true);
    return s;
}

int main() {
    string s = read();
    int n = s.size();
    //top part
    for (int i = 0; i < (n + 1) / 2; i++) {
        cout << string(i, ' ') + s.substr(i, n - i * 2) << endl;
    }
    //bottom part
    for (int i = (n + 1) / 2 - 1; i >= 0; i--) {
        cout << string(i, ' ') + s.substr(i, n - i * 2) << endl;
    }//*/
    return 0;
}