diff --git a/data/bit_0.c b/data/bit_0.c
index e290873..7c19f19 100644
--- a/data/bit_0.c
+++ b/data/bit_0.c
@@ -4,6 +4,5 @@ int main() {
 	int x, y;
 	scanf("%x %x", &x, &y);
 
-	//printf("%x\n", x^y);
 	return x^y;
 }
diff --git a/data/rwx.c b/data/rwx.c
new file mode 100644
index 0000000..687ab1f
--- /dev/null
+++ b/data/rwx.c
@@ -0,0 +1,82 @@
+#include <stdio.h>
+#include <string.h>
+
+void print_permission(char *s);
+int main() {
+	int i;
+	char res[10] = "";
+	char x[4] = "";
+	char buf[4] = "";
+	scanf("%s", x);
+	
+	for (i = 0; i < 3; ++i) {
+		switch (x[i]) {
+			case '0':
+				buf[0] = '0';
+				buf[1] = '0';
+				buf[2] = '0';
+				break;
+			case '1':
+				buf[0] = '0';
+				buf[1] = '0';
+				buf[2] = '1';
+				break;
+			case '2':
+				buf[0] = '0';
+				buf[1] = '1';
+				buf[2] = '0';
+				break;
+			case '3':
+				buf[0] = '0';
+				buf[1] = '1';
+				buf[2] = '1';
+				break;
+			case '4':
+				buf[0] = '1';
+				buf[1] = '0';
+				buf[2] = '0';
+				break;
+			case '5':
+				buf[0] = '1';
+				buf[1] = '0';
+				buf[2] = '1';
+				break;
+			case '6':
+				buf[0] = '1';
+				buf[1] = '1';
+				buf[2] = '0';
+				break;
+			case '7':
+				buf[0] = '1';
+				buf[1] = '1';
+				buf[2] = '1';
+				break;
+		}
+		buf[3] = '\0';
+		strcpy(res + 3*i, buf);
+	}
+	res[9] = '\0';
+
+	print_permission(res);
+
+	return 0;
+}
+
+
+void print_permission(char *s) {
+	//for (int i = strlen(s) - 1; i >= 0; --i) {
+	for (int i = 0; i < (int)strlen(s); ++i) {
+		if (s[i] != '0') {
+			if ((i + 1) % 3 == 0)
+				putchar('x');
+			else if ((i + 1) % 3 == 1)
+				putchar('r');
+			else
+				putchar('w');
+		}
+		else
+			putchar('-');
+
+	}
+	putchar('\n');
+}