diff --git a/.vscode/settings.json b/.vscode/settings.json
index 91e2cef..6103329 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -1,5 +1,74 @@
-{
-	"files.associations": {
-		"iosfwd": "cpp"
-	}
+{
+	"files.associations": {
+		"iostream": "cpp",
+		"iomanip": "cpp",
+		"ostream": "cpp",
+		"array": "cpp",
+		"atomic": "cpp",
+		"*.tcc": "cpp",
+		"bitset": "cpp",
+		"cctype": "cpp",
+		"cfenv": "cpp",
+		"chrono": "cpp",
+		"cinttypes": "cpp",
+		"clocale": "cpp",
+		"cmath": "cpp",
+		"codecvt": "cpp",
+		"complex": "cpp",
+		"condition_variable": "cpp",
+		"csetjmp": "cpp",
+		"csignal": "cpp",
+		"cstdarg": "cpp",
+		"cstddef": "cpp",
+		"cstdint": "cpp",
+		"cstdio": "cpp",
+		"cstdlib": "cpp",
+		"cstring": "cpp",
+		"ctime": "cpp",
+		"cuchar": "cpp",
+		"cwchar": "cpp",
+		"cwctype": "cpp",
+		"deque": "cpp",
+		"forward_list": "cpp",
+		"list": "cpp",
+		"unordered_map": "cpp",
+		"unordered_set": "cpp",
+		"vector": "cpp",
+		"exception": "cpp",
+		"algorithm": "cpp",
+		"functional": "cpp",
+		"iterator": "cpp",
+		"map": "cpp",
+		"memory": "cpp",
+		"memory_resource": "cpp",
+		"numeric": "cpp",
+		"optional": "cpp",
+		"random": "cpp",
+		"ratio": "cpp",
+		"regex": "cpp",
+		"set": "cpp",
+		"string": "cpp",
+		"string_view": "cpp",
+		"system_error": "cpp",
+		"tuple": "cpp",
+		"type_traits": "cpp",
+		"utility": "cpp",
+		"fstream": "cpp",
+		"future": "cpp",
+		"initializer_list": "cpp",
+		"iosfwd": "cpp",
+		"istream": "cpp",
+		"limits": "cpp",
+		"mutex": "cpp",
+		"new": "cpp",
+		"scoped_allocator": "cpp",
+		"shared_mutex": "cpp",
+		"sstream": "cpp",
+		"stdexcept": "cpp",
+		"streambuf": "cpp",
+		"thread": "cpp",
+		"typeindex": "cpp",
+		"typeinfo": "cpp",
+		"valarray": "cpp"
+	}
 }
\ No newline at end of file
diff --git a/guess.cpp b/guess.cpp
new file mode 100644
index 0000000..035150d
--- /dev/null
+++ b/guess.cpp
@@ -0,0 +1,43 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+int K[101];
+string charact[101][101];
+
+int main() {
+	ifstream cin("guess.in");
+	ofstream cout("guess.out");
+
+	int N;
+	cin >> N;
+
+	for (int i = 0; i < N; ++i) {
+		string name;
+		cin >> name;
+
+		cin >> K[i];
+		for (int j = 0; j < K[i]; ++j) cin >> charact[i][j];
+	}
+
+	int ans = 0;
+	for (int a = 0; a < N; ++a) {
+		for (int b = a + 1; b < N; ++b) {
+			int cnt = 0; // a and b are the two animals
+
+			for (int i = 0; i < K[a]; ++i) {
+				bool found = false;
+
+				// search for a's charact in b's characts
+				for (int j = 0; j < K[b]; ++j) {
+					if (charact[a][i] == charact[b][j]) found = true;
+				}
+
+				if (found == true) ++cnt;
+			}
+
+			ans = max(cnt + 1, ans);
+		}
+	}
+
+	cout << ans;
+}
\ No newline at end of file
diff --git a/gymnastics.java b/gymnastics.java
deleted file mode 100644
index e69de29..0000000
diff --git a/gymnastics.py b/gymnastics.py
deleted file mode 100644
index e69de29..0000000
diff --git a/lineup.cpp b/lineup.cpp
deleted file mode 100644
index 7121a4b..0000000
--- a/lineup.cpp
+++ /dev/null
@@ -1,6 +0,0 @@
-#include <bits/stdc++.h>
-using namespace std;
-
-int main() {
-	
-}
\ No newline at end of file
diff --git a/lineup.java b/lineup.java
deleted file mode 100644
index a63e60e..0000000
--- a/lineup.java
+++ /dev/null
@@ -1,3 +0,0 @@
-public class lineup {
-	
-}
\ No newline at end of file
diff --git a/lineup.py b/lineup.py
deleted file mode 100644
index e69de29..0000000
diff --git a/shell.cpp b/shell.cpp
new file mode 100644
index 0000000..97b641d
--- /dev/null
+++ b/shell.cpp
@@ -0,0 +1,38 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+int main() {
+	ifstream cin("shell.in");
+	ofstream cout("shell.out");
+
+	int N;
+	cin >> N;
+
+	int a[101], b[101], g[101];
+	for (int i = 0; i < N; ++i) {
+		cin >> a[i] >> b[i] >> g[i];
+	}
+
+	int ans = 0;
+
+	for (int start : { 1, 2, 3 }) {
+		int pos = start;
+		int cnt = 0;
+		for (int i = 0; i < N; ++i) {
+			if (pos == a[i]) {
+				pos = b[i];
+			}
+			else if (pos == b[i]) {
+				pos = a[i];
+			}
+
+			if (pos == g[i]) {
+				++cnt;
+			}
+		}
+
+		ans = max(cnt, ans);
+	}
+
+	cout << ans;
+}
\ No newline at end of file
diff --git a/sleepy.cpp b/sleepy.cpp
new file mode 100644
index 0000000..145ff3a
--- /dev/null
+++ b/sleepy.cpp
@@ -0,0 +1,25 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+int main() {
+	ifstream cin("sleepy.in");
+	ofstream cout("sleepy.out");
+
+	int N;
+	cin >> N;
+
+	int p[101];
+	for (int i = 0; i < N; ++i) cin >> p[i];
+
+	int ans = 1;
+	for (int i = N - 2; i >= 0; --i) {
+		if (p[i] < p[i + 1]) {
+			++ans;
+		}
+		else {
+			break;
+		}
+	}
+
+	cout << N - ans;
+}
\ No newline at end of file
diff --git a/whereami.java b/whereami.java
deleted file mode 100644
index e69de29..0000000
diff --git a/whereami.py b/whereami.py
deleted file mode 100644
index e69de29..0000000