//1005 bot taisaku
#include <bits/stdc++.h>
#define rep(i ,n) for(int i=0;i<(int)(n);++i)
using namespace std;
typedef long long int int64;
typedef unsigned long long uint64;

int main(){
    string s , t;
    cin >> s >> t;
    bool bot = false;
    int counter = 0;
    if(t.size() == 1 ){
        rep(i ,s.size()){
            if(t[0] == s[i]) { bot = true; break; }
        }
    }
    if(s.find(t)!=string::npos) {
        int pos = 0 ;
        while(s.find(t,pos)!=string::npos){
            int i = s.find(t,pos);
            ++counter;
            pos = t.size()-1+i;
        } 
    }
    cout << ( bot ? -1 : counter ) << endl;
}