# Write an efficient function that deletes characters from an ASCII
# string where any character existing in remove must be deleted from
# str. For example, given a str of "Battle of the Vowels: Hawaii vs.
# Grozny" and a remove of "aeiou", the function should transform str
# to “Bttl f th Vwls: Hw vs. Grzny”.


def removeChars(main_string, remove_string):
    result = ""
    for char in main_string:
        if char not in remove_string:
            result += char
    return result


given_input = "Battle of the Vowels: Hawaii vs. Grozny"
vowels = "aeiou"
print(removeChars(given_input, vowels))
