How to get same value of multiple lists

Question

Lets say  I have 4 lists

List<int> list1 = new List<int>();
list1.Add(4);
list1.Add(5);
list1.Add(6);
list1.Add(7);
list1.Add(9);
list1.Add(1);

List<int> list2 = new List<int>();
list1.Add(4);
list1.Add(7);
list1.Add(3);
list1.Add(0);

List<int> list3 = new List<int>();
list1.Add(0);
list1.Add(5);

List<int> list4 = new List<int>();
list1.Add(8);
list1.Add(5);
list1.Add(6);
list1.Add(7);
list1.Add(9);
list1.Add(1);
list1.Add(0);
list1.Add(3);
list1.Add(11);

i was thinking about starting with the list with the highest amount of number :  list4[A] than loop to each list and see if the other lists contain that number and do A+1

 

so it gets to next value in the list4 until it reaches the end of the list

 

but there must be a more easy way that i don't know of yet