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

答案错误70分