#include<bits/stdc++.h> using namespace std; int main(){ char s1[200],s2[200]; cin>>s1>>s2; if(strstr(s1,s2)) cout<<s1<<" is substring of "<<s2; else if(strstr(s2,s1)) cout<<s2<<" is substring of "<<s1; else cout<<"No substring"; return 0; }