03. Characters in Range

first = input()
second = input()


def solve():
    result = ''
    for i in range(ord(first) + 1, ord(second)):
        result += f'{chr(i)} '
    return result


print(solve())


Решение с map() и join():

first = input()
second = input()


def solve():
    return ' '.join(map(chr, range(ord(first) + 1, ord(second))))


print(solve())

Или:

def solve():
    return ' '.join(map(chr, range(ord(input()) + 1, ord(input()))))


print(solve())