given an integer convert it to a roman numeral input is guaranteed to be within the range from 1 to 3999 type num int rtype str type num int rtype str
def int_to_roman(num):
    
    m = ["", "M", "MM", "MMM"];
    c = ["", "C", "CC", "CCC", "CD", "D", "DC", "DCC", "DCCC", "CM"];
    x = ["", "X", "XX", "XXX", "XL", "L", "LX", "LXX", "LXXX", "XC"];
    i = ["", "I", "II", "III", "IV", "V", "VI", "VII", "VIII", "IX"];
    return m[num//1000] + c[(num%1000)//100] + x[(num%100)//10] + i[num%10];