The RUNTIME ERROR COMES FOR SOME TEST CASES SINCE THE THE INPUT SIZE OF THE STRING WHEN MULTIPLIED WITH K IT BECOMES HUGE STRING WHICH IS TOUGH PROCESS. SO AT FIRST JUST SUM ALL THE DIGITS IN NUMBER STRING AND MULTIPLY WITH K. FOR EXMP: n='11' k=2 p=n*k p='1111' # this could our naive approach s=4 # sum of all digits. now,

p= (sum of all digits in n which is equal to 2) * k

=> p=4 #same as our naive approach.

!/bin/python3

import math import os import random import re import sys

def superDigit(n, k): # Write your code here #base condition if len(n)==1: return int(n) s=0 for i in n: s=s+int(i) p=s*k if k>1 else s

return superDigit(str(p),1)

if name == 'main': fptr = open(os.environ['OUTPUT_PATH'], 'w')

first_multiple_input = input().rstrip().split()

n = first_multiple_input[0]

k = int(first_multiple_input[1])

result = superDigit(n, k)

fptr.write(str(result) + '\n')

fptr.close()