diff --git a/include/input.h b/include/input.h
deleted file mode 100644
index 952c5b0..0000000
--- a/include/input.h
+++ /dev/null
@@ -1,11 +0,0 @@
-#ifndef ADVENT_H_INPUT
-#define ADVENT_H_INPUT
-
-#include <stdlib.h>
-
-char *get_input(const char *);
-char **get_lines(const char *, size_t *);
-int *get_ints(const char *, size_t *);
-void del_lines(char **);
-
-#endif // ADVENT_H_INPUT
diff --git a/lib/libflint b/lib/libflint
index d564364..fa9b383 160000
--- a/lib/libflint
+++ b/lib/libflint
@@ -1 +1 @@
-Subproject commit d5643646860cdc2e0401b63094408753893e3ae0
+Subproject commit fa9b383c437ba88a108fff200fdfd245d859ab54
diff --git a/src/input.c b/src/input.c
deleted file mode 100644
index 35bbfd9..0000000
--- a/src/input.c
+++ /dev/null
@@ -1,80 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <limits.h>
-
-#ifdef __linux__
-#include <bsd/stdlib.h>
-#endif
-
-#include "input.h"
-
-char *get_input(const char *path) {
-    FILE *fp = NULL;
-    fp = fopen(path, "r");
-    if (fp == NULL) {
-        printf("Failed to open %s. Exiting.\n", path);
-        exit(1);
-    }
-
-    fseek(fp, 0, SEEK_END);
-    size_t fsz = ftell(fp);
-    rewind(fp);
-
-    char* buf = NULL;
-    buf = malloc(fsz + 1);
-    if (buf == NULL) {
-        printf("Failed to malloc buf. Exiting.\n");
-        exit(1);
-    }
-
-    fread(buf, 1, fsz, fp);
-    buf[fsz] = '\0';
-    fclose(fp);
-
-    return buf;
-}
-
-char **get_lines(const char *path, size_t *lsz) {
-    char **lines = NULL;
-    char *delim = "\n";
-    char *s = get_input(path), *t = strtok(s, delim);
-    size_t n = 0;
-
-    while (t != NULL) {
-        lines = realloc(lines, sizeof(char *) * ++n);
-        if (lines == NULL) {
-            printf("Failed to realloc lines buffer. Exiting.\n");
-            exit(1);
-        }
-        lines[n - 1] = t;
-        t = strtok(NULL, delim);
-    }
-
-    *lsz = n;
-    return lines;
-}
-
-int *get_ints(const char *path, size_t *sz) {
-    char **lines = get_lines(path, sz);
-    int *i = malloc(sizeof(int) * *sz);
-
-    for (size_t idx = 0; idx < *sz; idx++) {
-        int n;
-        const char *errstr;
-        n = strtonum(lines[idx], INT_MIN, INT_MAX, &errstr);
-        if (errstr) {
-            printf("Failed to convert %s to int. Exiting.\n", lines[idx]);
-            exit(1);
-        }
-        i[idx] = n;
-    }
-
-    del_lines(lines);
-    return i;
-}
-
-void del_lines(char **lines) {
-    free(lines[0]);
-    free(lines);
-}