#include<bits/stdc++.h>
using namespace std;
string s1;
string s2;
int main(){
	cin>>s1>>s2;
	if(s1.find(s2)!=-1){
		cout<<s1.find(s2);
	}else{
		cout<<"-1";
	}
	
	
	return 0;
} 

#include<bits/stdc++.h>
using namespace std;
int main()
{
	string s1,s2;
	cin>>s1>>s2;
	if(s1.find(s2)!=-1)
	{
		cout<<s1.find(s2);
	}
	else
	{
		cout<<-1;
	}
	return 0;
}