def solution(pw):
    has_lower = has_upper = has_digit = False
    for ch in pw:
        if 'a' <= ch <= 'z':
            has_lower = True
        if 'A' <= ch <= 'Z':
            has_upper = True
        if '0' <= ch <= '9':
            has_digit = True
    if has_lower and has_upper and has_digit:
        return True
    return False

pw = "Abc123"
ret = solution(pw)
print("solution 함수의 반환 값은", ret, "입니다.")