diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..4d9ea4a
Binary files /dev/null and b/.DS_Store differ
diff --git a/Git_ Exercise.xcodeproj/project.pbxproj b/Git_ Exercise.xcodeproj/project.pbxproj
index 424a5e0..2f5250c 100644
--- a/Git_ Exercise.xcodeproj/project.pbxproj	
+++ b/Git_ Exercise.xcodeproj/project.pbxproj	
@@ -8,6 +8,10 @@
 
 /* Begin PBXBuildFile section */
 		2768CA08294F453B00990B98 /* main.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2768CA07294F453B00990B98 /* main.swift */; };
+		EBE68051294FFF3200EB47C3 /* Student.swift in Sources */ = {isa = PBXBuildFile; fileRef = EBE68050294FFF3200EB47C3 /* Student.swift */; };
+		EBE68053294FFF5C00EB47C3 /* Grade.swift in Sources */ = {isa = PBXBuildFile; fileRef = EBE68052294FFF5C00EB47C3 /* Grade.swift */; };
+		EBE680552950010A00EB47C3 /* InputError.swift in Sources */ = {isa = PBXBuildFile; fileRef = EBE680542950010A00EB47C3 /* InputError.swift */; };
+		EBE680572950043B00EB47C3 /* InputManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = EBE680562950043B00EB47C3 /* InputManager.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXCopyFilesBuildPhase section */
@@ -25,6 +29,10 @@
 /* Begin PBXFileReference section */
 		2768CA04294F453B00990B98 /* Git_ Exercise */ = {isa = PBXFileReference; explicitFileType = "compiled.mach-o.executable"; includeInIndex = 0; path = "Git_ Exercise"; sourceTree = BUILT_PRODUCTS_DIR; };
 		2768CA07294F453B00990B98 /* main.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = main.swift; sourceTree = "<group>"; };
+		EBE68050294FFF3200EB47C3 /* Student.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; name = Student.swift; path = ../../../../../Documents/Student.swift; sourceTree = "<group>"; };
+		EBE68052294FFF5C00EB47C3 /* Grade.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; name = Grade.swift; path = ../../../../../Documents/Grade.swift; sourceTree = "<group>"; };
+		EBE680542950010A00EB47C3 /* InputError.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; name = InputError.swift; path = ../../../../../Documents/InputError.swift; sourceTree = "<group>"; };
+		EBE680562950043B00EB47C3 /* InputManager.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; name = InputManager.swift; path = ../../../../../Documents/InputManager.swift; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -58,6 +66,10 @@
 			isa = PBXGroup;
 			children = (
 				2768CA07294F453B00990B98 /* main.swift */,
+				EBE68050294FFF3200EB47C3 /* Student.swift */,
+				EBE68052294FFF5C00EB47C3 /* Grade.swift */,
+				EBE680542950010A00EB47C3 /* InputError.swift */,
+				EBE680562950043B00EB47C3 /* InputManager.swift */,
 			);
 			path = "Git_ Exercise";
 			sourceTree = "<group>";
@@ -120,7 +132,11 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				EBE680572950043B00EB47C3 /* InputManager.swift in Sources */,
 				2768CA08294F453B00990B98 /* main.swift in Sources */,
+				EBE680552950010A00EB47C3 /* InputError.swift in Sources */,
+				EBE68051294FFF3200EB47C3 /* Student.swift in Sources */,
+				EBE68053294FFF5C00EB47C3 /* Grade.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
diff --git a/Git_ Exercise.xcodeproj/project.xcworkspace/xcuserdata/jojo.xcuserdatad/UserInterfaceState.xcuserstate b/Git_ Exercise.xcodeproj/project.xcworkspace/xcuserdata/jojo.xcuserdatad/UserInterfaceState.xcuserstate
new file mode 100644
index 0000000..13429e0
Binary files /dev/null and b/Git_ Exercise.xcodeproj/project.xcworkspace/xcuserdata/jojo.xcuserdatad/UserInterfaceState.xcuserstate differ
diff --git a/Git_ Exercise.xcodeproj/xcuserdata/jojo.xcuserdatad/xcschemes/xcschememanagement.plist b/Git_ Exercise.xcodeproj/xcuserdata/jojo.xcuserdatad/xcschemes/xcschememanagement.plist
new file mode 100644
index 0000000..9cab2b7
--- /dev/null
+++ b/Git_ Exercise.xcodeproj/xcuserdata/jojo.xcuserdatad/xcschemes/xcschememanagement.plist	
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>SchemeUserState</key>
+	<dict>
+		<key>Git_ Exercise.xcscheme_^#shared#^_</key>
+		<dict>
+			<key>orderHint</key>
+			<integer>0</integer>
+		</dict>
+	</dict>
+</dict>
+</plist>