diff --git a/aider/io.py b/aider/io.py
index e7f6f79b2..20903c3dc 100644
--- a/aider/io.py
+++ b/aider/io.py
@@ -358,7 +358,9 @@ class InputOutput:
         rel_fnames = list(rel_fnames)
         show = ""
         if rel_fnames:
-            rel_read_only_fnames = [os.path.relpath(fname, root) for fname in (abs_read_only_fnames or [])]
+            rel_read_only_fnames = [
+                os.path.relpath(fname, root) for fname in (abs_read_only_fnames or [])
+            ]
             show = self.format_files_for_input(rel_fnames, rel_read_only_fnames)
         if edit_format:
             show += edit_format
@@ -698,57 +700,14 @@ class InputOutput:
                 self.chat_history_file = None  # Disable further attempts to write
 
     def format_files_for_input(self, rel_fnames, rel_read_only_fnames):
-        minimal_unique_fileids = self.compute_minimal_fileids(rel_fnames)
-
-        # Format the filename for display in the prompt, with disambiguating path
-        # in parentheses, if needed.
-        def format_minimal_fileid(fname):
-            pth = Path(minimal_unique_fileids[fname])
-            if len(pth.parts) > 1:
-                return f"{pth.name} ({'/'.join(pth.parts[:-1])})"
-            else:
-                return pth.name
-
         read_only_files = []
-        for full_path in (rel_read_only_fnames or []):
-            name = format_minimal_fileid(full_path)
-            read_only_files.append(f" R {name}")
+        for full_path in rel_read_only_fnames or []:
+            read_only_files.append(f"{full_path} (read only)")
 
         editable_files = []
         for full_path in rel_fnames:
             if full_path in rel_read_only_fnames:
                 continue
-            name = format_minimal_fileid(full_path)
-            editable_files.append(f"   {name}")
+            editable_files.append(f"{full_path}")
 
-        return "\n".join(read_only_files + editable_files) + '\n'
-
-    def compute_minimal_fileids(self, rel_fnames):
-        # First pass: group files with the same name
-        grouped_fnames = defaultdict(list)
-        for full_path in rel_fnames:
-            pth = Path(full_path)
-            fname = pth.name
-            grouped_fnames[fname].append(list(pth.parts))
-
-        # Second pass: compute the shared prefix of each group of files.
-        shared_prefixes = {}
-        for fname, paths in grouped_fnames.items():
-            shared_prefix = []
-            while all(len(path) > 1 for path in paths):
-                next_part = paths[0][0]
-                if not all(path[0] == next_part for path in paths):
-                    break
-                shared_prefix.append(next_part)
-                paths = [path[1:] for path in paths]
-            shared_prefixes[fname] = Path(*shared_prefix)
-
-        # Third pass: subtract the shared prefix from the full path to get the minimal unique id
-        minimal_unique_ids = {}
-        for full_path in rel_fnames:
-            pth = Path(full_path)
-            fname = pth.name
-            prefix = shared_prefixes[fname]
-            minimal_unique_ids[full_path] = str(pth.relative_to(prefix))
-
-        return minimal_unique_ids
\ No newline at end of file
+        return "\n".join(read_only_files + editable_files) + "\n"