diff --git a/v4/main.py b/v4/main.py
index 8158023..5218ff2 100644
--- a/v4/main.py
+++ b/v4/main.py
@@ -1,5 +1,6 @@
 from memory_test import *
-from memoryCLI import *
+from shell import *
+from shell_test import *
 import sys
 
 print(memory_test_generateConstPlayfield())
@@ -11,10 +12,20 @@ print(memory_test_shouldDeselectMismatchedItems_itemTwice())
 print(memory_test_shouldDetectVictory())
 print(memory_test_shouldHideMatchingItems())
 
-c = memoryCLI_createContext()
-c = memoryCLI_greetUser(c)
-print(c.output)
+print(shell_test_exit_e())
+print(shell_test_exit_exit())
+print(shell_test_exit_q())
+print(shell_test_exit_quit())
+
+c = shell_createContext()
+c = shell_start(c)
+if c.recentField == "output":
+    print(c.output)
 
 for line in sys.stdin:
-    ln = line.rstrip()
-    print(f"you entered: '{ln}'")
+    c.input = line.rstrip()
+    c = shell_processInput(c)
+    if c.recentField == "output":
+        print(c.output)
+    elif c.recentField == "exit":
+        break
diff --git a/v4/shell.py b/v4/shell.py
new file mode 100644
index 0000000..551b569
--- /dev/null
+++ b/v4/shell.py
@@ -0,0 +1,36 @@
+from shell_Context import *
+from llm import *
+
+# Greet the user upon start
+@llm_by_value
+def shell_start(
+  c: shell_Context
+) -> shell_Context:
+  c.output = "Shell.StartText"
+  c.recentField = "output"
+  return c
+#}
+
+# Switch among CLI functions based on input
+#
+# Conditions:
+# 1. User requested to quit the game
+# 2. User plays the game
+@llm_by_value
+def shell_processInput(
+  c: shell_Context
+) -> shell_Context:
+  if (
+    c.input == "e" or
+    c.input == "exit" or
+    c.input == "q" or
+    c.input == "quit"
+  ):
+    c.exit = True
+    c.recentField = "exit"
+    return c
+
+  c.output = "TODO Call all CLI functions, let them process game input"
+  c.recentField = "output"
+  return c
+#}
diff --git a/v4/shell_Context.py b/v4/shell_Context.py
new file mode 100644
index 0000000..59d7d32
--- /dev/null
+++ b/v4/shell_Context.py
@@ -0,0 +1,8 @@
+class shell_Context:
+  def __init__(self):
+    self.exit = False
+    self.input = ""
+    self.output = ""
+
+def shell_createContext():
+  return shell_Context()
diff --git a/v4/shell_test.py b/v4/shell_test.py
new file mode 100644
index 0000000..097846a
--- /dev/null
+++ b/v4/shell_test.py
@@ -0,0 +1,54 @@
+from shell import *
+from shell_Context import *
+
+def shell_test_exit_e(
+) -> str:
+  c = shell_createContext()
+  c.input = "e"
+  c = shell_processInput(c)
+  if (
+    c.recentField == "exit"
+  ):
+    return "OK: shell_exit_e"
+  #}
+  return "ERR: shell_exit_e"
+#}
+
+def shell_test_exit_exit(
+) -> str:
+  c = shell_createContext()
+  c.input = "exit"
+  c = shell_processInput(c)
+  if (
+    c.recentField == "exit"
+  ):
+    return "OK: shell_exit_exit"
+  #}
+  return "ERR: shell_exit_exit"
+#}
+
+def shell_test_exit_q(
+) -> str:
+  c = shell_createContext()
+  c.input = "q"
+  c = shell_processInput(c)
+  if (
+    c.recentField == "exit"
+  ):
+    return "OK: shell_exit_q"
+  #}
+  return "ERR: shell_exit_q"
+#}
+
+def shell_test_exit_quit(
+) -> str:
+  c = shell_createContext()
+  c.input = "quit"
+  c = shell_processInput(c)
+  if (
+    c.recentField == "exit"
+  ):
+    return "OK: shell_exit_quit"
+  #}
+  return "ERR: shell_exit_quit"
+#}