diff --git a/days/comp.py b/days/comp.py
index 32a282b..34fff41 100644
--- a/days/comp.py
+++ b/days/comp.py
@@ -1,7 +1,23 @@
+from typing import *
+
+
 class OpcodeComputer():
-    def parse_param(self, pc, mem):
-        i = str(mem[pc])
-        a, b, c = (0, 0, 0)
+
+    def parse_param(self, pc: int, mem: List[int]) \
+            -> Tuple[int, int, int, int]:
+        """Parse Intcode and return parameters as specified by parameter mode
+
+        Args:
+            pc (int): current instruction pointer
+            mem (List[int]): program code
+
+        Returns:
+            Tuple[int, int, int, int]: current opcode, parameter a, b and c
+        """
+        i: str = str(mem[pc])
+        a: int = 0
+        b: int = 0
+        c: int = 0
         try:
             a = mem[pc+1] if i[-3:-4:-1] == '1' else mem[mem[pc+1]]
             b = mem[pc+2] if i[-4:-5:-1] == '1' else mem[mem[pc+2]]
@@ -10,9 +26,17 @@ class OpcodeComputer():
             pass
         return (int(i[-2:]), a, b, c)
 
-    def process_op(self, mem):
-        pc = 0
-        cmd = mem[pc]
+    def process_op(self, mem: List[int]) -> int:
+        """Run program code
+
+        Args:
+            mem (List[int]): Memory to run OpcodeComputer on
+
+        Returns:
+            int: Content in memory at position 0
+        """
+        pc: int = 0
+        cmd: int = mem[pc]
         while cmd != 99:
             cmd, a, b, c = self.parse_param(pc, mem)
             if cmd == 1:
@@ -39,3 +63,11 @@ class OpcodeComputer():
                 pc += 4
             cmd = mem[pc]
         return mem[0]
+
+
+def input() -> str:
+    return input()
+
+
+def print(text: str):
+    print(text)