use std::io::*;

fn main() {
    let mut s: String = String::new();
    std::io::stdin().read_to_string(&mut s).ok();
    let mut itr = s.trim().split_whitespace();
    let s: &str = itr.next().unwrap();
    let t: &str = itr.next().unwrap();
    if t.len() == 1 && s.find(t) != None {
        println!("-1");
        return;
    }
    let s = format!("{}{}", t, s);
    let s: Vec<char> = s.chars().collect();
    let n = s.len();
    let mut a: Vec<usize> = vec![0; s.len()];
    a[0] = n;
    let mut i = 1;
    let mut j = 0;
    while i < n {
        while i + j < n && s[j] == s[i + j] {
            j += 1;
        }
        a[i] = j;
        if j == 0 {
            i += 1;
            continue;
        }
        let mut k = 1;
        while i + k < n && k + a[k] < j {
            a[i + k] = a[k];
            k += 1;
        }
        i += k;
        j -= k;
    }

    let mut ans = 0;
    let mut i = t.len();
    while i < n {
        if a[i] >= t.len() {
            ans += 1;
            i += t.len() - 1;
        } else {
            i += 1;
        }
    }
    println!("{}", ans);
}