Write a function sumFirstDigits() that takes a list of positive integer numbers as parameter, returns a string made of the first (leftmost) digits of the numbers in the list. Example: If the parameter list contains [44, 800, 7, 14], the function will return 20 (= 4 + 8 + 7 + 1). Hint: The first digit of a number can be obtained by converting the number to string, then getting the first character, then by converting this character to integer.