def input_int(s, default_value, valid_list=None, help_message=None):
    while True:
        try:
            inp = input(s)
            if len(inp) == 0:
                raise ValueError("")
                
            if help_message is not None and inp == '?':
                print (help_message)
                continue
            
            i = int(inp)
            if (valid_list is not None) and (i not in valid_list):
                return default_value
            return i
        except:
            print (default_value)
            return default_value
        
def input_bool(s, default_value, help_message=None):
    while True:
        try:
            inp = input(s)
            if len(inp) == 0:
                raise ValueError("")
                
            if help_message is not None and inp == '?':
                print (help_message)
                continue
                
            return bool ( {"y":True,"n":False,"1":True,"0":False}.get(inp.lower(), default_value) )
        except:
            print ( "y" if default_value else "n" )
            return default_value
        
def input_str(s, default_value, valid_list=None, help_message=None):
    while True:        
        try:
            inp = input(s)
            if len(inp) == 0:
                raise ValueError("")
                
            if help_message is not None and inp == '?':
                print (help_message)
                continue
                
            if (valid_list is not None) and (inp.lower() not in valid_list):
                return default_value
            return inp
        except:
            print (default_value)
            return default_value