cubic.py

def primary_cubic (num) :
    if len(num) <= 3 :
        list_str_num = list(num)
        try :
            list_int_num = [int(i) for i in list_str_num ]
            sum = 0
            for j in list_int_num :
                sum += j*j*j
            if sum == int(num) :
                print (num , end = " ")
        except ValueError :
            pass
    
    
def secondary_cubic (string_of_num ) :
    list_of_num = string_of_num.split( )
            
    for num in list_of_num :
        primary_cubic(num)
string_of_num = input("Enter a string :")
secondary_cubic(string_of_num)