A TIMES B!

from sys import argv


def convolve(F, G):
    NF = len(F)
    NG = len(G)
    N = NF + NG - 1
    C = [0 for _ in range(N)]
    s = 0
    for i in range(N):
        for j in range(max(0, i - NG), i + 1):
            if j < NF and (i - j) < NG:
                s += F[j] * G[i - j]
        C[i] = s
        s = 0
    return C


def carry(data):
    """Perform carrying, meaning that
    the "number" [2, 17, 5] becomes [3, 7, 5].
    """
    change = 1
    while change:
        change = 0
        cp = [0 for _ in data]
        for idx, e in enumerate(data):
            if e >= 10:
                change = 1
                car = e // 10
                cp[idx - 1] += car
                cp[idx] = e - (car * 10)
            else:
                cp[idx] = e
        data = cp
    return cp


if __name__ == "__main__":
    x, y = input().split()
    x = [int(c) for c in x]
    y = [int(c) for c in y]
    C = convolve(x, y)
    M = carry(C)
    strM = "".join([str(e) for e in M])
    print(strM)

Test 1

Verdict: RUNTIME ERROR

Traceback (most recent call last):
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Test 2

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Test 3

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Test 4

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Test 5

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Test 6

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Test 7

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Test 8

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Test 9

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Test 10

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Test 11

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Test 12

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Test 13

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Test 14

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Test 15

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Test 16

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Test 17

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Test 18

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Test 19

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Test 20

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Test 21

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Test 22

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Test 23

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Test 24

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Test 25

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Test 26

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Test 27

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Test 28

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Test 29

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Test 30

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Test 31

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Test 32

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Test 33

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Test 34

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Test 35

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Test 36

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Test 37

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Test 38

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Test 39

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Test 40

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Test 41

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Test 42

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Test 43

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Test 44

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Test 45

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Test 46

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Test 47

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Test 48

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Test 49

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Test 50

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Test 51

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Test 52

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Test 53

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Test 54

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Test 55

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Test 56

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Test 57

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Test 58

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Test 59

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Test 60

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Test 61

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Test 62

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Test 63

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Test 64

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Test 65

Verdict: RUNTIME ERROR

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