from collections import defaultdict
import sys
from typing import Counter
readline=sys.stdin.readline
write=sys.stdout.write
from math import gcd as GCD
import math

S=list(readline().rstrip())
T=list(readline().rstrip())
ans=0
queue=[]
if len(T)==1 and T[0] in S:
    ans=-1
else:
    for s in S:
        if len(queue)>=len(T)-1 and queue[len(queue)-len(T)+1:]==T[:-1]:
            queue.append(".")
            ans+=1
        queue.append(s)
print(ans)