S = input()
BOT = input()


if len(BOT) == 1 and S.count(BOT) != 0:
    print("-1")
elif len(BOT) == 2 and BOT[0]==BOT[1]:
    cnt = 0
    for i in range(len(S)-len(BOT)+1):
        if S[i:i+len(BOT)] == BOT:
            cnt += 1
    print(cnt)
else:
    print(S.count(BOT))