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