Converting digit/number to words

def numToWords(num):
    length_of_string = len(num);  
    if (length_of_string == 0): 
        print("String is Empty"); 
        return; 
    if (length_of_string > 4): 
        print("Please enter the string with supported length"); 
        return;  
    ones_digits = ["zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"]; 
    tens_digits = ["", "ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen","nineteen"]; 
    multiple_of_ten = ["", "", "twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety"]; 
    power_of_ten = ["hundred", "thousand"];   
    print(num, ":", end = " ");
    if (length_of_string == 1):  
        print(ones_digits[ord(num[0]) - '0']); 
        return;
    x = 0; 
    while (x < len(num)): if (length_of_string >= 3): 
            if (ord(num[x]) - 48 != 0): 
                print(ones_digits[ord(num[x]) - 48], end = " "); 
                print(power_of_ten[length_of_string - 3], end = " ");  
            length_of_string -= 1; 
        else: 
            if (ord(num[x]) - 48 == 1):  
                sum = (ord(num[x]) - 48 + ord(num[x]) - 48); 
                print(tens_digits[sum]); 
                return;
            elif (ord(num[x]) - 48 == 2 and ord(num[x + 1]) - 48 == 0): 
                print("twenty"); 
                return; 
            else: 
                i = ord(num[x]) - 48; 
                if(i > 0): 
                    print(multiple_of_ten[i], end = " "); 
                else: 
                    print("", end = ""); 
                x += 1; 
                if(ord(num[x]) - 48 != 0): 
                    print(ones_digits[ord(num[x]) - 48]); 
        x += 1; 
numToWords("1121")