import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Scanner;

class Main {
	public static void main(String[] args) throws Exception {
		new Main().run();
	}
	
	void run() {
		Scanner sc=new Scanner(System.in);
		String S=sc.next();
		String T=sc.next();
		int ans=0;
		for(int i=0;i<S.length();){
			if(i+T.length()<=S.length()&&S.substring(i,i+T.length()).equals(T)){
				if(T.length()==1){
					System.out.println(-1);
					return;
				}
				i=i+T.length()-1;
				++ans;
				continue;
			}
			++i;
		}
		System.out.println(ans);
	}
	
	static void tr(Object... objects) {
		System.out.println(Arrays.deepToString(objects));
	}
	
}