diff --git a/main.py b/main.py
index 7f7ed68..738648b 100755
--- a/main.py
+++ b/main.py
@@ -10,11 +10,11 @@
         "value": value,
     }
 
-def do_system_print(env, args):
+def do_system_print(subject, args):
     print(args[0]["value"])
     return None
 
-def do_system_read(env, args):
+def do_system_read(subject, args):
     return make_text(input())
 
 base_env = {
@@ -40,7 +40,7 @@
     args = []
     for arg in ast[3]:
         args.append(resolve_value(env, arg))
-    return command(env, args)
+    return command(subject, args)
 
 def run_set(env, ast):
     env[ast[1]] = run_statement(env, ast[2])