diff --git a/src/.prototype/run.sh b/src/.prototype/run.sh
index d1ab6b6..2a7b040 100644
--- a/src/.prototype/run.sh
+++ b/src/.prototype/run.sh
@@ -7,8 +7,6 @@ main() {
    }
    trap cleanup EXIT
 
-   local pipe=/tmp/breel.pipe
-   test -e "$pipe" || mkfifo $pipe
    while true; do
       read -s v
       echo "$v"
diff --git a/src/input.py b/src/input.py
new file mode 100644
index 0000000..410c247
--- /dev/null
+++ b/src/input.py
@@ -0,0 +1,17 @@
+class Input:
+   def __init__(self, reader):
+      self.reader = reader
+
+   def get(self):
+      return self.reader.read()
+
+class StdinReader:
+   def read(self):
+      return input()
+
+class FileReader:
+   def __init__(self, path):
+      self.f = open(path, "r")
+
+   def read(self):
+      return self.f.readline()
diff --git a/src/main.py b/src/main.py
new file mode 100644
index 0000000..0d49abf
--- /dev/null
+++ b/src/main.py
@@ -0,0 +1,5 @@
+def main():
+   raise Exception("not impl")
+
+if __name__ == "__main__":
+   main()
diff --git a/src/output.py b/src/output.py
new file mode 100644
index 0000000..ad9a74f
--- /dev/null
+++ b/src/output.py
@@ -0,0 +1,30 @@
+import time
+
+class Output:
+   def __init__(self):
+      self.previous = None
+
+   def write(self, latest):
+      chosen = Line.choose(self.previous, latest)
+      if chosen.v != self.previous.v:
+         print(chosen)
+      self.previous = chosen
+
+class Line:
+   def __init__(self, v):
+      self.t = time.time()
+      self.v = v
+
+   def __str__(self):
+      return f'@{self.t} | {self.v}'
+
+   def choose(a, b):
+      if not a:
+         return b
+      if not b:
+         return a
+      latest = max([a,b], key=lambda x:x.t)
+      oldest = min([a,b], key=lambda x:x.t)
+      if not latest.v and time.time() - oldest.t < 1:
+         return oldest
+      return latest