diff --git a/.gitignore b/.gitignore
index 7e419b8..a9d3269 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,6 +6,3 @@
 *.scm~
 *.scm#*
 .#*.scm
-
-easy.in
-hard.in
diff --git a/day01-easy/easy.in b/day01-easy/easy.in
new file mode 100644
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diff --git a/day05-easy/easy.in b/day05-easy/easy.in
new file mode 100644
index 0000000..aac101c
--- /dev/null
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\ No newline at end of file
diff --git a/day05-hard/hard.in b/day05-hard/hard.in
new file mode 100644
index 0000000..aac101c
--- /dev/null
+++ b/day05-hard/hard.in
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\ No newline at end of file
diff --git a/example/hello.scm b/example/hello.scm
new file mode 100755
index 0000000..60d8103
--- /dev/null
+++ b/example/hello.scm
@@ -0,0 +1,37 @@
+#!/usr/bin/guile -s
+!#
+#!(display "Hello, world!\n")!#
+
+(use-modules (ice-9 rdelim))
+
+#!(let ((x (read)))
+  (display (* x x))
+  (newline))
+!#
+
+(define (read-myline)
+  (read-line))
+
+(define (read-lines)
+  (let loop ((line (read-line)))
+    (if
+      (eof-object? line)
+      '()
+      (cons line (loop (read-line))))))
+
+(define (sum lines)
+  (if
+    (null? lines)
+    0
+    (+ (string-length (car lines)) (sum (cdr lines)))
+    ))
+
+(display (sum (read-lines)))
+
+#!(let loop ((line (read)))
+  (format #t "line: ~a\n" line)
+  (display (* line line))
+  (if (not (eof-object? line))
+    (begin
+      (format #t "read next line\n")
+      (loop (read)))))!#
\ No newline at end of file
diff --git a/example/sample.in b/example/sample.in
new file mode 100644
index 0000000..d8de9e4
--- /dev/null
+++ b/example/sample.in
@@ -0,0 +1,6 @@
+8
+1
+21234567
+3
+4
+5