Write a Python program that given the score sheet of participants in a competition, you are required to find the runner-up score. You are given scores in a list. Find the score of the runner-up.

list1 - [2, 3, 6, 6, 5] runner_up - 5 list2 - [1, 7, 5, 3, 10, 4, 5, 5, 6, 11] runner_up - 10