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

我只有80分！！！！！