题解

#include <bits/stdc++.h>
using namespace std;
int main()
{
	string s1,s2;
	cin>>s1>>s2;
	if(s1.find(s2)!=-1){
		cout<<s2<<" is substring of " <<s1; 
	}else if(s2.find(s1)!=-1){
		cout<<s1<<" is substring of " <<s2;
	}
	else{
		cout<<"No substring"; 
	}
	
	return 0;
}