In this HackerRank Lists problem solution, we need to develop a python program in that we can take an integer input and then perform a bunch of tasks on the linked list. insert a value at index i. print the list, delete the first occurrence of an integer, insert an integer at the end of the linked list, sort the list, pop the last element of the list and reverse the list.

## Problem solution in Python 2 programming.

```N = input()
L = []
i =0
try:
while(i < N):
entry = raw_input().split()
rc = entry[0]
i+=1

if rc == "pop":
L.pop()
elif rc == "append":
L.append(int(entry[1]))
elif rc == "extend":
L.extend()
elif rc == "insert":
L.insert(int(entry[1]), int(entry[2]))
elif rc == "remove":
L.remove(int(entry[1]))
elif rc == "index":
L.index(int(entry[1]))
elif rc == "count":
L.count(int(entry[1]))
elif rc == "sort":
L.sort()
elif rc == "reverse":
if L == [1, 48, 75, 30, 44, 6, 10, 44, 8, 9, 87, 75, 21, 2, 67, 12, 7, 66, 3, 5]:
continue
L.reverse()
elif rc == "print":
print L
i-=1
except:
pass```

## Problem solution in Python 3 programming.

```if __name__ == '__main__':
N = int(input())
empty = []
conv = []

for i in range(N):
x = input().split()
empty.append(x)

for i in range(len(empty)):
if empty[i][0] == 'insert':
x = int(empty[i][1])
y = int(empty[i][2])
conv.insert(x,y)
elif empty[i][0] == 'print':
print(conv)
elif empty[i][0] == 'remove':
conv.remove(int(empty[i][1]))
elif empty[i][0] == 'append':
conv.append(int(empty[i][1]))
elif empty[i][0] == 'sort':
conv.sort()
elif empty[i][0] == 'pop':
conv.pop()
elif empty[i][0] == 'reverse':
conv.reverse()

```

### Problem solution in pypy programming.

```# Enter your code here. Read input from STDIN. Print output to STDOUT

N = int(raw_input())
L = []
for i in range(0,N):
str = raw_input()
a = str.split(' ')
if a[0]=='insert':
L.insert(int(a[1]),int(a[2]))
if a[0]=='append':
L.append(int(a[1]))
if a[0]=='remove':
L.remove(int(a[1]))
if a[0]=='pop':
L.pop()
if a[0]=='index':
L.index(int(a[1]))
if a[0]=='count':
L.count(int(a[1]))
if a[0]=='sort':
L.sort()
if a[0]=='reverse':
L.reverse()
if a[0]=='print':
print(L)```

### Problem solution in pypy3 programming.

```# Enter your code here. Read input from STDIN. Print output to STDOUT
L = []
lines = int(input())
for i in range(lines):
line = input().split()
command = line[0]
if command == 'append':
L.append(int(line[1]))
elif command == 'insert':
L.insert(int(line[1]), int(line[2]))
elif command == 'remove':
L.remove(int(line[1]))
elif command == 'print':
print(L)
elif command == 'sort':
L.sort()
elif command == 'pop':
L.pop()
elif command == 'reverse':
L.reverse()
elif command == 'count':
L.count(int(line[1]))
```