Buggy python submission (verdict: Time Limit Exceeded):
def solve():
    BASE = 10**9 + 7
    MOD = 2**31 - 1  # メルセンヌ素数

    # [Ssの先頭lenRH文字]のハッシュ値を求める
    def getHash(Ss, lenRH):
        hashS = 0
        for S in Ss[:lenRH]:
            hashS *= BASE
            hashS += ord(S)
            hashS %= MOD
        return hashS

    ss = input()
    ts = input()

    cs = set(ss)
    ct = set(ts)
    if len(cs) == 1 and len(ct) == 1 and cs == ct:
        print(-1)
        return

    Ss = ss + ss
    lenS, lenT = len(Ss), len(ts)
    lenRH = lenT

    powB_P = pow(BASE, lenRH)

    hashS = getHash(Ss, lenRH)
    hashT = getHash(ts, lenRH)

    isFounds = [False] * lenS

    Ss += '$' # ダミー
    for i in range(lenS - lenRH + 1):
        # ハッシュ値が一致
        if hashS == hashT:
            isFounds[i] = True
        hashS *= BASE
        hashS += ord(Ss[i+lenRH]) - ord(Ss[i])*powB_P
        hashS %= MOD
#    print(isFounds)

    ans = 0
    for i in range(lenS):
        if not isFounds[i]: continue
        num = 0
        for j in range(i, lenS, lenT):
            if isFounds[j]:
                num += 1
                isFounds[j] = False
            else:
                break
#        ans = max(ans, num)
        if num > ans:
            ans = num

    if lenS % lenT == 0 and ans == lenS//lenT:
        print(-1)
    else:
        print(ans)


solve()


Fixed submission:
def getTableKMP(Ss):
    Ss += '$'
    lenS = len(Ss)
    table = [-1] * lenS
    j = -1
    for i in range(lenS-1):
        while j >= 0 and Ss[i] != Ss[j]:
            j = table[j]
        j += 1
        if Ss[i+1] == Ss[j]:
            table[i+1] = table[j]
        else:
            table[i+1] = j
    return table

def getPosPtnsKMP(Ss, ptn, table):
    anss = []
    lenS, lenP = len(Ss), len(ptn)
    iS, iP = 0, 0
    while iS < lenS:
        if Ss[iS] == ptn[iP]:
            iS += 1
            iP += 1
            if iP == lenP:
                anss.append(iS-lenP)
                iP = table[iP]
        else:
            iP = table[iP]
            if iP == -1:
                iS += 1
                iP = 0
    return anss


Ss = input()
Ts = input()

lenS, lenT = len(Ss), len(Ts)
num = (lenT+lenS-1+lenS-1) // lenS
S2s = Ss * num

tableKMP = getTableKMP(Ts)
posPtns = getPosPtnsKMP(S2s, Ts, tableKMP)

isFounds = [False] * lenS
for pos in posPtns:
    if pos >= lenS:
        break
    isFounds[pos] = True

ans = 0
numDone = 0
for i in range(lenS):
    if not isFounds[i]:
        i = (i+lenT) % lenS
        for num in range(lenS+1):
            if not isFounds[i]:
                ans = max(ans, num)
                numDone += num+1
                break
            i = (i+lenT) % lenS
        else:
            ans = -1
            break

if numDone < lenS:
    ans = -1
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
def solve():
    BASE = 10**9 + 7
    MOD = 2**61 - 1  # メルセンヌ素数

    # [Ssの先頭lenRH文字]のハッシュ値を求める
    def getHash(Ss, lenRH):
        hashS = 0
        for S in Ss[:lenRH]:
            hashS *= BASE
            hashS += ord(S)
            hashS %= MOD
        return hashS

    ss = input()
    ts = input()

    cs = set(ss)
    ct = set(ts)
    if len(cs) == 1 and len(ct) == 1 and cs == ct:
        print(-1)
        return
    elif ss.replace(ts, '') == '':
        print(-1)
        return

    Ss = ss + ss
    lenS, lenT = len(Ss), len(ts)
    lenRH = lenT

    powB_P = pow(BASE, lenRH)

    hashS = getHash(Ss, lenRH)
    hashT = getHash(ts, lenRH)

    isFounds = [False] * lenS

    Ss += '$' # ダミー
    for i in range(lenS - lenRH + 1):
        # ハッシュ値が一致
        if hashS == hashT:
            isFounds[i] = True
        hashS *= BASE
        hashS += ord(Ss[i+lenRH]) - ord(Ss[i])*powB_P
        hashS %= MOD
#    print(isFounds)

    ans = 0
    for i in range(lenS):
        if not isFounds[i]: continue
        num = 0
        for j in range(i, lenS, lenT):
            if isFounds[j]:
                num += 1
                isFounds[j] = False
            else:
                break
        ans = max(ans, num)

    print(ans)


solve()


Fixed submission:
def getTableKMP(Ss):
    Ss += '$'
    lenS = len(Ss)
    table = [-1] * lenS
    j = -1
    for i in range(lenS-1):
        while j >= 0 and Ss[i] != Ss[j]:
            j = table[j]
        j += 1
        if Ss[i+1] == Ss[j]:
            table[i+1] = table[j]
        else:
            table[i+1] = j
    return table

def getPosPtnsKMP(Ss, ptn, table):
    anss = []
    lenS, lenP = len(Ss), len(ptn)
    iS, iP = 0, 0
    while iS < lenS:
        if Ss[iS] == ptn[iP]:
            iS += 1
            iP += 1
            if iP == lenP:
                anss.append(iS-lenP)
                iP = table[iP]
        else:
            iP = table[iP]
            if iP == -1:
                iS += 1
                iP = 0
    return anss


Ss = input()
Ts = input()

lenS, lenT = len(Ss), len(Ts)
num = (lenT+lenS-1+lenS-1) // lenS
S2s = Ss * num

tableKMP = getTableKMP(Ts)
posPtns = getPosPtnsKMP(S2s, Ts, tableKMP)

isFounds = [False] * lenS
for pos in posPtns:
    if pos >= lenS:
        break
    isFounds[pos] = True

ans = 0
numDone = 0
for i in range(lenS):
    if not isFounds[i]:
        i = (i+lenT) % lenS
        for num in range(lenS+1):
            if not isFounds[i]:
                ans = max(ans, num)
                numDone += num+1
                break
            i = (i+lenT) % lenS
        else:
            ans = -1
            break

if numDone < lenS:
    ans = -1
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
def solve():
    BASE = 10**9 + 7
    MOD = 2**61 - 1  # メルセンヌ素数

    # [Ssの先頭lenRH文字]のハッシュ値を求める
    def getHash(Ss, lenRH):
        hashS = 0
        for S in Ss[:lenRH]:
            hashS *= BASE
            hashS += ord(S)
            hashS %= MOD
        return hashS

    ss = input()
    ts = input()

    cs = set(ss)
    ct = set(ts)
    if len(cs) == 1 and len(ct) == 1 and cs == ct:
        print(-1)
        return
    elif ss.replace(ts, '') == '':
        print(-1)
        return

    Ss = ss + ss
    lenS, lenT = len(Ss), len(ts)
    lenRH = lenT

    powB_P = pow(BASE, lenRH)

    hashS = getHash(Ss, lenRH)
    hashT = getHash(ts, lenRH)

    isFounds = [False] * lenS

    Ss += '$' # ダミー
    for i in range(lenS - lenRH + 1):
        # ハッシュ値が一致
        if hashS == hashT:
            isFounds[i] = True
        hashS *= BASE
        hashS += ord(Ss[i+lenRH]) - ord(Ss[i])*powB_P
        hashS %= MOD
#    print(isFounds)

    ans = 0
    for i in range(lenS):
        if not isFounds[i]: continue
        num = 0
        for j in range(i, lenS, lenT):
            if isFounds[j]:
                num += 1
                isFounds[j] = False
            else:
                break
        ans = max(ans, num)

    print(ans)


solve()


Fixed submission:
def getTableKMP(Ss):
    Ss += '$'
    lenS = len(Ss)
    table = [-1] * lenS
    j = -1
    for i in range(lenS-1):
        while j >= 0 and Ss[i] != Ss[j]:
            j = table[j]
        j += 1
        if Ss[i+1] == Ss[j]:
            table[i+1] = table[j]
        else:
            table[i+1] = j
    return table

def getPosPtnsKMP(Ss, ptn, table):
    anss = []
    lenS, lenP = len(Ss), len(ptn)
    iS, iP = 0, 0
    while iS < lenS:
        if Ss[iS] == ptn[iP]:
            iS += 1
            iP += 1
            if iP == lenP:
                anss.append(iS-lenP)
                iP = table[iP]
        else:
            iP = table[iP]
            if iP == -1:
                iS += 1
                iP = 0
    return anss


Ss = input()
Ts = input()

lenS, lenT = len(Ss), len(Ts)
num = (lenT+lenS-1+lenS-1) // lenS
S2s = Ss * num

tableKMP = getTableKMP(Ts)
posPtns = getPosPtnsKMP(S2s, Ts, tableKMP)

isFounds = [False] * lenS
for pos in posPtns:
    if pos >= lenS:
        break
    isFounds[pos] = True

ans = 0
numDone = 0
for i in range(lenS):
    if not isFounds[i]:
        i = (i+lenT) % lenS
        for num in range(lenS+1):
            if not isFounds[i]:
                ans = max(ans, num)
                numDone += num+1
                break
            i = (i+lenT) % lenS
        else:
            ans = -1
            break

if numDone < lenS:
    ans = -1
print(ans)