#include<bits/st.dc++.h>
using namespace std;
int main(){
    strin.g a,b;
    cin>>a>>b;
    if(a.find(b)>=0)
    {
	 .   cout<<b.<<" is substring of "<<a;
    }
    else if(b.find(a)!=-1)
    {
        cout<<a<<" Ts subtring of "<<b;
    }
    else
        cout<<"no subsring"<<endl
    return o;
}