#include <bits/stdc++.h>
#define all(v) v.begin(),v.end()
#define eb emplace_back
#define N 1000010
using namespace std;
using ll=long long;
using P=pair<int,int>;
const ll INF=1LL<<30;
inline void chmin(int &a,int b){a=min(a,b);}
int dy[4]={0,-1,0,1};
int dx[4]={1,0,-1,0};
int to[4]={2,3,0,1};
int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	string s,t;cin>>s>>t;
	int n=s.length(),m=t.length();
	int ma=-1;
	int res=0;
	for(int i=0;i<n;i++){
		if(m==1&&t[0]==s[i]){
			cout<<-1<<endl;
			return 0;
		}
		if(i+m<=n&&s.substr(i,m)==t){
			if(i<=ma&&ma+1<i+m)continue;
			ma=i+m-2;
			res++;
		}
	}
	cout<<res<<endl;
}