HAHAHA

#include <iostream>
#include <cstring>
using namespace std;
void found(string s1, string s2){
    int len = s1.size();
    if(s1.find(s2) <= len){
        cout << s1.find(s2);
    }else{
        cout << -1;
    }
    return ;
}
int main(){
    string s1, s2;
    cin >> s1 >> s2;
    found(s1, s2);
    return 0;
}