// #define _GLIBCXX_DEBUG // for STL debug (optional)
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <string>
#include <cstring>
#include <deque>
#include <list>
#include <queue>
#include <stack>
#include <vector>
#include <utility>
#include <algorithm>
#include <map>
#include <set>
#include <complex>
#include <cmath>
#include <limits>
#include <cfloat>
#include <climits>
#include <ctime>
#include <cassert>
#include <numeric>
#include <fstream>
#include <functional>
#include <bitset>
using namespace std;
using ll = long long int;
using int64 = long long int;
 
template<typename T> void chmax(T &a, T b) {a = max(a, b);}
template<typename T> void chmin(T &a, T b) {a = min(a, b);}
template<typename T> void chadd(T &a, T b) {a = a + b;}
 
int dx[] = {0, 0, 1, -1};
int dy[] = {1, -1, 0, 0};
const int INF = 1LL << 29;
const ll LONGINF = 1LL << 60;
const ll MOD = 1000000007LL;
 
int main() {
    string s, t; cin >> s >> t;
    int N = s.size(), M = t.size();
    vector<int> rec;
    for(int i=0; i+M<=N; i++) {
        if(s.substr(i, M) == t) rec.emplace_back(i);
    }

    if(M == 1 and rec.size() > 0) {
        cout << -1 << endl;
        return 0;
    }
    
    int last = -INF, ans = 0;
    for(size_t i=0; i<rec.size(); i++) {
        if(last + M - 1 <= rec[i]) {
            last = rec[i];
            ans++;
        }
    }

    cout << ans << endl;
    return 0;
}