AAAAcccc

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