文件目录

#include <iostream>
using namespace std;
int main()
{
    string a, b;
    cin >> a >> b;
    if (b.size() > a.size())
        swap(a, b);
    if (a.find(b) >= a.size())
        cout << "No substring";
    else
        cout << b << " is substring of " << a;
    return 0;
}