--- /dev/null
+#!/usr/bin/python3
+
+from collections import deque
+
+def get_answer(initial_data, end_count):
+ x=len(initial_data)
+ seen={}
+ for index,number in enumerate(initial_data,1):
+ seen[number]=index
+ last_answer=initial_data[-1]
+ while x < end_count:
+ answer=0
+ if last_answer in seen:
+ answer=x-seen[last_answer]
+ seen[last_answer]=x
+ x+=1
+ last_answer=answer
+ yield answer
+
+
+initial_data=[int(a) for a in open("input.txt", "r").readline().split(",")]
+
+print("Part 1: ", deque((get_answer(initial_data,2020)),maxlen=1).pop())
+print("Part 2: ", deque((get_answer(initial_data,30000000)),maxlen=1).pop())