def parse_string(str):
    dict = {
        "a": "A",
        "b": "B",
        "c": "C"
    }
    no_space = [x for x in str if x != " "]
    result = ""
    for letter in no_space:
        if letter in dict:
            result += dict[letter]
        else:
            result += letter
    return result