ver. exit

+def exitPG(user_echo):
+    if user_echo == "exit":
+        return True
+    else:
+        return False
+
+
 user_echo = input()
 
-print(user_echo)
\ No newline at end of file
+
+if exitPG(user_echo) == False:
+
+    print(user_echo)
+
+elif exitPG(user_echo) == True:
+    print("프로그램을 종료합니다.")
\ No newline at end of file