To preserve black spaces in totaly, i did it.

!/bin/python3

import math import os import random import re import sys

Complete the solve function below.

def solve(s):

new_word = []
last_char = ''

for index, char in enumerate(s):


    if index == 0:
        new_word.append(char.capitalize())
        last_char = char
        continue


    if last_char == ' ' and char == ' ': # Last char is space and new char is space
        new_word.append(char)

    elif last_char.isalnum(): # Last char is alpha, dont capitalize
        new_word.append(char)

    elif last_char == ' ' and char.isalnum():
        new_word.append(char.capitalize())

    last_char = char

return ''.join(new_word)

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

s = input()

result = solve(s)

fptr.write(result + '\n')

fptr.close()