s = input()
t = input()
if len(t)==1 and s.count(t)>=1:
    print(-1)
else:
    ans = 0
    while s.count(t)!=0:
        x = s.find(t)
        s = s[:x+len(t)-1]+'.'+s[x+len(t)-1:]
        ans += 1
    print(ans)