import java.io.BufferedReader
import java.io.InputStream
import java.io.InputStreamReader
import java.lang.StringBuilder
import java.util.*

fun main(args: Array<String>) {
    val sc = FastScanner(System.`in`)
    val s = sc.nextLine()
    val t = sc.nextLine()
    val count = (s.length - s.replace(t, "").length) / t.length
    if (count > 0 && t.length == 1) {
        println(-1)
    } else {
        println(count)
    }
}

class FastScanner(s: InputStream) {
    private var st = StringTokenizer("")
    private val br = BufferedReader(InputStreamReader(s))

    fun next(): String {
        while (!st.hasMoreTokens()) st = StringTokenizer(br.readLine())

        return st.nextToken()
    }

    fun nextInt() = next().toInt()
    fun nextLong() = next().toLong()
    fun nextLine() = br.readLine()
    fun nextDouble() = next().toDouble()
    fun ready() = br.ready()
}