Index: .fossil-settings/ignore-glob
==================================================================
--- .fossil-settings/ignore-glob
+++ .fossil-settings/ignore-glob
@@ -1,4 +1,5 @@
 aoc
 aocdbg
 aocclang
 aoctcc
+inputs/*

Index: aoc.c
==================================================================
--- aoc.c
+++ aoc.c
@@ -16,18 +16,18 @@
         d = strtoul(argv[2], &err, 10);
         if (*err || (d < 1) || (d > 25)) d = 0;
         if (argc >= 4) {
             sprintf(dataname, "%.98s", argv[3]);
         } else {
-            sprintf(dataname, ".%04u%02u.txt", y, d);
+            sprintf(dataname, "inputs/%04u%02u.txt", y, d);
         }
     }
     if ((y == 0) || (d == 0)) {
         fprintf(stderr, "syntax: %s yyyy dd [input-file]\n", argv[0]);
         fprintf(stderr, "    where 2015 <= yyyy <= %d\n", MAX_YEAR);
         fprintf(stderr, "    and 1 <= dd <= 25\n");
-        fprintf(stderr, "if no [input-file] is supplied loads the file .yyyydd.txt\n");
+        fprintf(stderr, "if no [input-file] is supplied loads the file inputs/yyyydd.txt\n");
         exit(EXIT_FAILURE);
     }
     // read data from dataname into input
     char *input = NULL;
     size_t ilen = slurp(&input, dataname);