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

为什么不对？？？