题解

#include<iostream>
#include<cstring>
using namespace std;
int main(){
	string a,b,c,d;
	cin>>a>>b>>c;
	d=a+b;
	if((int)(d.find(c))!=-1){
		cout<<c<<" is substring of "<<a<<" and "<<b; 
	}else{
		cout<<c<<" is not substring of "<<a<<" and "<<b; 
	}
	
	return 0;
}