题解

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