121. Write a function to merge three stacks into one.
122. Implement a function to get the sum of even elements in a stack.
123. Write a function to get the sum of odd elements in a stack.
124. Implement a function to check if the stack is a Fibonacci sequence.
125. Write a function to find the longest increasing sequence in a stack.
126. Implement a function to find the longest decreasing sequence in a stack.
127. Write a function to create a stack of integers and sort it.
128. Implement a function to find the median of elements in a stack.
129. Write a function to find the intersection of three stacks.
130. Implement a function to find the union of three stacks.
131. Write a function to find if a stack is a palindrome of numbers.
132. Implement a function to push and pop elements from a stack in a loop.
133. Write a function to implement a dynamic stack that expands its capacity.
134. Implement a function to remove the middle element from a stack.
135. Write a function to find pairs of elements that sum to a specific value in a stack.
136. Implement a function to check if a stack can form a valid sequence of operations.
137. Write a function to find the kth largest unique element in a stack.
138. Implement a function to generate a stack from a range of numbers.
139. Write a function to check for duplicates in a stack and remove them.
140. Implement a function to implement a min/max stack that returns both.
141. Write a function to find the first non-repeating element in a stack.
142. Implement a function to push elements from one stack to another in reverse order.
143. Write a function to rotate elements in a stack by N positions.
144. Implement a function to find the smallest element in a stack that is not a duplicate.
145. Write a function to generate a stack with random numbers.
146. Implement a function to check if a stack can be emptied by a series of pops.
147. Write a function to find the longest sequence of consecutive numbers in a stack.
148. Implement a function to create a stack of characters from a string.
149. Write a function to find the frequency of elements in a stack.
150. Implement a function to count the number of unique elements in a stack.
151. Write a function to implement a stack that returns elements in a sorted manner.
152. Implement a function to find all distinct elements in a stack.
153. Write a function to merge two stacks while maintaining their order.
154. Implement a function to create a stack of tuples and perform operations.
155. Write a function to check if the sum of elements in a stack is even or odd.
156. Implement a function to find the greatest common divisor (GCD) of elements in a stack.
157. Write a function to find the least common multiple (LCM) of elements in a stack.
158. Implement a function to create a stack of dictionaries and perform operations.
159. Write a function to perform operations on a stack based on user input.
160. Implement a function to clear a stack and check if it still contains elements.