Roller coaster

import sys
import math
sys.set_int_max_str_digits(3000000)

import sys
 
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):
    res = data[:]
    for i in range(len(res) - 1, 0, -1):
        if res[i] >= 10:
            res[i - 1] += res[i] // 10
            res[i] %= 10
            
    while res[0] >= 10:
        res.insert(0, res[0] // 10)
        res[1] %= 10
        
    return res
 
input_data = sys.stdin.read().split()
x = [int(input_data[0])]
y = [int(input_data[1])]
C = convolve(x, y)
M = carry(C)
print(*M, sep='')


#a = int(input())
#b = int(input())
#
#def multiplyFaster(a:int,b:int) -> int:
#    if ( a==0 or b==0):
#        return 0
#    if (math.log2(min(a,b)) < 50000):
#        return a*b
#    shift = int(math.log2(max(a,b)))//2
#    a1 = a>>shift
#    a0 = a&((1<<shift)-1)
#    #print((a1<<shift)+a0==a)
#    b1 = b>>shift
#    b0 = b&((1<<shift)-1)
#    #print((b1<<shift)+b0==b)
#    return (multiplyFaster(a1,b1)<<(2*shift))+((multiplyFaster(a1,b0)+multiplyFaster(a0,b1))<<(shift))+multiplyFaster(a0,b0)
#
#result = multiplyFaster(a,b)
##print(a*b)
#print(result)
#print(result == a*b)

Test 1

Verdict: WRONG ANSWER

Test 2

Verdict: WRONG ANSWER

Test 3

Verdict: WRONG ANSWER

Test 4

Verdict: WRONG ANSWER

Test 5

Verdict: ACCEPTED

Test 6

Verdict: WRONG ANSWER

Test 7

Verdict: WRONG ANSWER

Test 8

Verdict: WRONG ANSWER

Test 9

Verdict: WRONG ANSWER

Test 10

Verdict: WRONG ANSWER

Test 11

Verdict: WRONG ANSWER

Test 12

Verdict: WRONG ANSWER