import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		char[] s = sc.next().toCharArray();
		char[] t = sc.next().toCharArray();
		sc.close();

		if (t.length == 1) {
			for (int i = 0; i < s.length; i++) {
				if (s[i] == t[0]) {
					System.out.println(-1);
					return;
				}
			}
			System.out.println(0);
			return;
		}

		int ans = 0;
		int j = 0;
		for (int i = 0; i < s.length; i++) {
			if (s[i] == t[j]) {
				if (j == t.length - 1) {
					ans++;
					j = 0;
					if (s[i] == t[j]) {
						j++;
					}
				} else {
					j++;
				}
			} else {
				j = 0;
			}
		}
		System.out.println(ans);
	}
}