# Write code that takes a two dimensional list of integers
# of at least size two, and finds the minimum and
# next minimum integer in this two dimensional list.
# You are guaranteed that all numbers in the list are unique.
# Return the two numbers with a dash between them;
# for example, if the incoming list is [[2,3],[1,4]]
# you would return 1-2.
# You may not use any built-in functions/methods besides len().