萌新第一次使用python提交总是RE

import matplotlib

def getDigits(x): 
    return [ int(a) for a in str(x) ]

def makeInt(digits): 
    return sum( [ 10**(len(digits)-i-1)*digits[i] for i in range(len(digits))])

def divideAndConquerMult1( X, Y ):
    return divideAndConquerMult1_helper( getDigits(X), getDigits(Y) )

def divideAndConquerMult1_helper( x, y ):
    n = max( len(x), len(y) )
    while len(x) < n:
        x.insert(0,0)
    while len(y) < n:
        y.insert(0,0)
    if n == 1:
        return x[0]*y[0] 
    mid = round(n/2)
    xhigh = x[:mid] 
    xlow = x[mid:] 
    yhigh = y[:mid]
    ylow = y[mid:]
    highhigh = divideAndConquerMult1_helper( xhigh , yhigh )
    highlow = divideAndConquerMult1_helper( xhigh , ylow )
    lowhigh = divideAndConquerMult1_helper( xlow , yhigh )
    lowlow = divideAndConquerMult1_helper( xlow , ylow )    
    HH = getDigits(highhigh) + [ 0 for i in range(2*(n - mid))]
    MID = getDigits(lowhigh + highlow) + [0 for i in range(n-mid)]
    LL = getDigits(lowlow)
    result = makeInt(HH) + makeInt(MID) + makeInt(LL)
    return result

a = input()
b = input()
print(divideAndConquerMult1(a,b))