Write a Python program to sort a list of lists of integers by the first element of the sublists. The list should be sorted in ascending order.
[[2, 4, 6], [1, 9, 8], [3, 7, 5]]
def sortList(lst): 
    lst.sort(key = lambda x: x[0]) 
    return lst 
  
result = sortList([[2, 4, 6], [1, 9, 8], [3, 7, 5]]) 
print(result)