#include <bits/stdc++.h>
using namespace std;

using ll = long long;
using ull = unsigned long long;
using ld = long double;
template<class t> using vc = vector<t>;
template<class t> using vvc = vc<vc<t>>;
using pi = pair<int,int>;
using vi = vc<int>;
using vvi = vvc<int>;

#define rep(i,a,b) for (int i = a; i < b; i++)
#define irep(i,a,b) for (int i = a; i > b; i--)
#define print(n) cout << n << '\n'
#define pritn(n) print(n)
#define rup(a,b) (a+b-1)/b
#define input(A,N) rep(i,0,N) cin>>A[i]
#define chmax(a,b) a = max(a,b)
#define chmin(a,b) a = min(a,b)


int main(){
    cout << fixed << setprecision(15);
    
    string s;
    string t;
    cin>>s>>t;
    ll count = 0;
    ll now = 0;
    while (now<s.size()){
        int ni = 0;
        if (now+t.size()>s.size()) break;
        bool p = true;
        while(ni<t.size()){
            if (s[ni+now]!=t[ni]){
                p = false;
                break;
            }else{
                ni += 1;
            }
        }
        if (p){
            if(now==now+t.size()-1){
                print(-1);
                return 0;
            }
            now += t.size()-1;
            count ++;
        }else{
            now ++;
        }
    }
    print(count);
    //system("pause");
    return 0;
}