package main

import (
	"fmt"
	"strings"
)

func main() {
	var cnt int
	var s, t string
	fmt.Scan(&s, &t)
	cnt = strings.Count(s, t)
	if cnt >= 1 && len(t) <= 1 {
		fmt.Println(-1)
	} else {
		fmt.Println(cnt)
	}
}